Hello guys,

I try to update Devel from 1.x to 2.0 with composer in a Drupal 8.6.7 composer based installation but Composer output a dependency conflict with Symfony/var-dumper package.

Here i my c.json :

{
    "name": "drupal-composer/drupal-project",
    "description": "Project template for Drupal 8 projects with composer",
    "type": "project",
    "license": "GPL-2.0-or-later",
    "authors": [
        {
            "name": "",
            "role": ""
        }
    ],
    "repositories": {
        "0": {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        },
        "d3": {
            "type": "package",
            "package": {
                "name": "d3/d3",
                "version": "v3.5.17",
                "type": "drupal-library",
                "dist": {
                    "url": "https://github.com/d3/d3/archive/v3.5.17.zip",
                    "type": "zip"
                }
            }
        },
        "highlightjs": {
            "type": "package",
            "package": {
                "name": "components/highlightjs",
                "version": "9.7.0",
                "type": "drupal-library",
                "dist": {
                    "url": "https://github.com/components/highlightjs/archive/9.7.0.zip",
                    "type": "zip"
                }
            }
        }
    },
    "require": {
        "components/highlightjs": "9.7.*",
        "composer/installers": "^1.2",
        "cweagans/composer-patches": "^1.6.5",
        "d3/d3": "3.5.*",
        "drupal-composer/drupal-scaffold": "^2.5",
        "drupal/addtoany": "^1.10",
        "drupal/admin_toolbar": "^1.25",
        "drupal/adminimal_admin_toolbar": "^1.8",
        "drupal/adminimal_theme": "^1.3",
        "drupal/antibot": "^1.2",
        "drupal/better_exposed_filters": "^3.0@alpha",
        "drupal/chosen": "^2.6",
        "drupal/commerce": "^2.11",
        "drupal/console": "^1.0.2",
        "drupal/core": "^8.6.0",
        "drupal/ctools": "^3.0",
        "drupal/devel": "^1.2",
        "drupal/dropzonejs": "^2.0@alpha",
        "drupal/editor_advanced_link": "^1.4",
        "drupal/entity_browser": "^2",
        "drupal/entity_clone": "^1.0@beta",
        "drupal/entity_usage": "^2.0@alpha",
        "drupal/field_group": "^3",
        "drupal/focal_point": "^1.0@beta",
        "drupal/geocoder": "^2.0",
        "drupal/geolocation": "^2",
        "drupal/honeypot": "^1.29",
        "drupal/image_widget_crop": "^2.2",
        "drupal/mailsystem": "^4.1",
        "drupal/media_entity_browser": "^2",
        "drupal/menu_block": "^1.5",
        "drupal/menu_breadcrumb": "^1.7",
        "drupal/metatag": "^1.7",
        "drupal/office_hours": "^1.1",
        "drupal/paragraphs": "^1.5",
        "drupal/pathauto": "^1.3",
        "drupal/redis": "^1.1",
        "drupal/search_api_solr": "~3",
        "drupal/swiftmailer": "^1.0@beta",
        "drupal/twig_tweak": "^2.1",
        "drupal/video": "^1.2",
        "drupal/views_exposed_filter_blocks": "^1.0",
        "drupal/webform_node_element": "^1.1",
        "drush/drush": "^9.5",
        "enyo/dropzone": "^5.5",
        "vlucas/phpdotenv": "^2.4",
        "webflo/drupal-finder": "^1.0.0",
        "webmozart/path-util": "^2.3"
    },
    "require-dev": {
        "webflo/drupal-core-require-dev": "^8.6.0"
    },
    "conflict": {
        "drupal/drupal": "*"
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "sort-packages": true
    },
    "autoload": {
        "classmap": [
            "scripts/composer/ScriptHandler.php"
        ],
        "files": [
            "load.environment.php"
        ]
    },
    "scripts": {
        "pre-install-cmd": [
            "DrupalProject\\composer\\ScriptHandler::checkComposerVersion"
        ],
        "pre-update-cmd": [
            "DrupalProject\\composer\\ScriptHandler::checkComposerVersion"
        ],
        "post-install-cmd": [
            "DrupalProject\\composer\\ScriptHandler::createRequiredFiles"
        ],
        "post-update-cmd": [
            "DrupalProject\\composer\\ScriptHandler::createRequiredFiles"
        ]
    },
    "extra": {
        "patchLevel": {
            "drupal/core": "-p2"
        },
        "installer-paths": {
            "web/core": [
                "type:drupal-core"
            ],
            "web/libraries/{$name}": [
                "type:drupal-library"
            ],
            "web/modules/contrib/{$name}": [
                "type:drupal-module"
            ],
            "web/profiles/contrib/{$name}": [
                "type:drupal-profile"
            ],
            "web/themes/contrib/{$name}": [
                "type:drupal-theme"
            ],
            "drush/Commands/{$name}": [
                "type:drupal-drush"
            ]
        },
        "drupal-scaffold": {
            "initial": {
                ".editorconfig": "../.editorconfig",
                ".gitattributes": "../.gitattributes"
            }
        }
    }
}

And the output from composer (Sorry for verbose output...) :

$> composer require drupal/devel:^2.0

./composer.json has been updated
> DrupalProject\composer\ScriptHandler::checkComposerVersion
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install drupal/devel 2.0.0
    - Conclusion: remove symfony/http-kernel v3.4.21
    - Conclusion: don't install symfony/http-kernel v3.4.21
    - symfony/var-dumper 2.7.x-dev conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper 2.8.x-dev conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper 3.0.x-dev conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper 3.1.x-dev conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper 3.2.x-dev conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.0 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.0-BETA1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.0-BETA2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.10 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.11 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.12 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.13 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.14 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.15 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.16 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.17 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.18 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.19 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.20 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.21 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.22 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.23 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.24 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.25 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.26 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.27 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.28 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.29 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.3 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.30 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.31 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.32 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.33 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.34 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.35 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.36 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.37 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.38 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.39 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.4 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.40 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.41 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.42 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.43 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.44 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.45 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.46 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.47 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.48 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.49 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.5 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.50 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.6 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.7 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.8 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.7.9 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.0 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.0-BETA1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.10 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.11 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.12 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.13 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.14 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.15 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.16 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.17 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.18 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.19 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.20 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.21 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.22 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.23 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.24 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.25 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.26 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.27 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.28 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.29 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.3 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.30 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.31 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.32 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.33 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.34 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.35 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.36 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.37 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.38 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.39 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.4 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.40 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.41 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.42 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.43 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.44 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.45 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.46 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.47 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.48 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.49 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.5 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.6 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.7 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.8 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v2.8.9 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.0 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.0-BETA1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.3 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.4 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.5 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.6 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.7 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.8 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.0.9 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.0 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.0-BETA1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.0-RC1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.10 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.3 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.4 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.5 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.6 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.7 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.8 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.1.9 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.0 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.0-BETA1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.0-RC1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.0-RC2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.1 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.10 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.11 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.12 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.13 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.14 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.2 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.3 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.4 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.5 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.6 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.7 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.8 conflicts with symfony/http-kernel[v3.4.21].
    - symfony/var-dumper v3.2.9 conflicts with symfony/http-kernel[v3.4.21].
    - Conclusion: don't install symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper 3.2.x-dev|install symfony/var-du
mper v2.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|install symfony/var-dumper v2.7.13
|install symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-dumper v2.7.2|install symfony/var-
dumper v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install symfony/var-dumper v2.7.27|insta
ll symfony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v2.7.33|install symfony/var-dumper
 v2.7.34|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfony/var-dumper v2.7.40|install symf
ony/var-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47|install symfony/var-dumper v2.7.
48|install symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dumper v2.7.9|install symfony/var-du
mper v2.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|install symfony/var-dumper v2.8.14|inst
all symfony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper v2.8.20|install symfony/var-dumpe
r v2.8.21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symfony/var-dumper v2.8.28|install sy
mfony/var-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.34|install symfony/var-dumper v2.8
.35|install symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var-dumper v2.8.41|install symfony/v
ar-dumper v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|install symfony/var-dumper v2.8.49|in
stall symfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.0.0-BETA1|install symfony/var-dum
per v3.0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/var-dumper v3.0.8|install symfony/
var-dumper v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2|install symfony/var-dumper v3.1.
3|install symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper v3.2.0|install symfony/var-dumpe
r v3.2.0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|install symfony/var-dumper v3.2.13|
install symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper v3.2.7|install symfony/var-dumper
 v3.2.8|install symfony/var-dumper v3.2.9
    - Conclusion: don't install drupal/devel 2.0.0|remove symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper 3.2.x-
dev|install symfony/var-dumper v2.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|install
symfony/var-dumper v2.7.13|install symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-dumper v
2.7.2|install symfony/var-dumper v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install symfon
y/var-dumper v2.7.27|install symfony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v2.7.33|
install symfony/var-dumper v2.7.34|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfony/var-d
umper v2.7.40|install symfony/var-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47|instal
l symfony/var-dumper v2.7.48|install symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dumper v2.
7.9|install symfony/var-dumper v2.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|install symfo
ny/var-dumper v2.8.14|install symfony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper v2.8.20
|install symfony/var-dumper v2.8.21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symfony/var
-dumper v2.8.28|install symfony/var-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.34|insta
ll symfony/var-dumper v2.8.35|install symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var-dumper
 v2.8.41|install symfony/var-dumper v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|install sym
fony/var-dumper v2.8.49|install symfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.0.0-BET
A1|install symfony/var-dumper v3.0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/var-dump
er v3.0.8|install symfony/var-dumper v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2|instal
l symfony/var-dumper v3.1.3|install symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper v3.2.0
|install symfony/var-dumper v3.2.0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|install s
ymfony/var-dumper v3.2.13|install symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper v3.2.7|
install symfony/var-dumper v3.2.8|install symfony/var-dumper v3.2.9
    - Conclusion: don't install drupal/devel 2.0.0|don't install symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper
 3.2.x-dev|install symfony/var-dumper v2.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|i
nstall symfony/var-dumper v2.7.13|install symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-d
umper v2.7.2|install symfony/var-dumper v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install
 symfony/var-dumper v2.7.27|install symfony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v
2.7.33|install symfony/var-dumper v2.7.34|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfon
y/var-dumper v2.7.40|install symfony/var-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47
|install symfony/var-dumper v2.7.48|install symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dum
per v2.7.9|install symfony/var-dumper v2.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|instal
l symfony/var-dumper v2.8.14|install symfony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper
v2.8.20|install symfony/var-dumper v2.8.21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symf
ony/var-dumper v2.8.28|install symfony/var-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.3
4|install symfony/var-dumper v2.8.35|install symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var
-dumper v2.8.41|install symfony/var-dumper v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|inst
all symfony/var-dumper v2.8.49|install symfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.
0.0-BETA1|install symfony/var-dumper v3.0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/v
ar-dumper v3.0.8|install symfony/var-dumper v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2
|install symfony/var-dumper v3.1.3|install symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper
 v3.2.0|install symfony/var-dumper v3.2.0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|in
stall symfony/var-dumper v3.2.13|install symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper
v3.2.7|install symfony/var-dumper v3.2.8|install symfony/var-dumper v3.2.9
    - Installation request for symfony/http-kernel (locked at v3.4.21) -> satisfiable by symfony/http-kernel[v3.4.21].
    - Conclusion: don't install drupal/devel 2.0.0|remove symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper 3.2.x-
dev|install symfony/var-dumper v2.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|install
symfony/var-dumper v2.7.13|install symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-dumper v
2.7.2|install symfony/var-dumper v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install symfon
y/var-dumper v2.7.27|install symfony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v2.7.33|
install symfony/var-dumper v2.7.34|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfony/var-d
umper v2.7.40|install symfony/var-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47|instal
l symfony/var-dumper v2.7.48|install symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dumper v2.
7.9|install symfony/var-dumper v2.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|install symfo
ny/var-dumper v2.8.14|install symfony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper v2.8.20
|install symfony/var-dumper v2.8.21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symfony/var
-dumper v2.8.28|install symfony/var-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.34|insta
ll symfony/var-dumper v2.8.35|install symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var-dumper
 v2.8.41|install symfony/var-dumper v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|install sym
fony/var-dumper v2.8.49|install symfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.0.0-BET
A1|install symfony/var-dumper v3.0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/var-dump
er v3.0.8|install symfony/var-dumper v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2|instal
l symfony/var-dumper v3.1.3|install symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper v3.2.0
|install symfony/var-dumper v3.2.0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|install s
ymfony/var-dumper v3.2.13|install symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper v3.2.7|
install symfony/var-dumper v3.2.8|install symfony/var-dumper v3.2.9
    - Conclusion: don't install drupal/devel 2.0.0|don't install symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper
 3.2.x-dev|install symfony/var-dumper v2.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|i
nstall symfony/var-dumper v2.7.13|install symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-d
umper v2.7.2|install symfony/var-dumper v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install
 symfony/var-dumper v2.7.27|install symfony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v
2.7.33|install symfony/var-dumper v2.7.34|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfon
y/var-dumper v2.7.40|install symfony/var-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47
|install symfony/var-dumper v2.7.48|install symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dum
per v2.7.9|install symfony/var-dumper v2.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|instal
l symfony/var-dumper v2.8.14|install symfony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper
v2.8.20|install symfony/var-dumper v2.8.21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symf
ony/var-dumper v2.8.28|install symfony/var-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.3
4|install symfony/var-dumper v2.8.35|install symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var
-dumper v2.8.41|install symfony/var-dumper v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|inst
all symfony/var-dumper v2.8.49|install symfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.
0.0-BETA1|install symfony/var-dumper v3.0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/v
ar-dumper v3.0.8|install symfony/var-dumper v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2
|install symfony/var-dumper v3.1.3|install symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper
 v3.2.0|install symfony/var-dumper v3.2.0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|in
stall symfony/var-dumper v3.2.13|install symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper
v3.2.7|install symfony/var-dumper v3.2.8|install symfony/var-dumper v3.2.9
    - Installation request for drupal/devel ^2.0 -> satisfiable by drupal/devel[2.x-dev, 2.0.0].
    - Conclusion: remove symfony/var-dumper v4.2.2|install symfony/var-dumper 2.7.x-dev|install symfony/var-dumper 2.8.x-dev|install symfony/var-dumper 3.0.x-dev|install symfony/var-dumper 3.1.x-dev|install symfony/var-dumper 3.2.x-dev|install symfony/var-dumper v2
.7.0|install symfony/var-dumper v2.7.0-BETA1|install symfony/var-dumper v2.7.0-BETA2|install symfony/var-dumper v2.7.1|install symfony/var-dumper v2.7.10|install symfony/var-dumper v2.7.11|install symfony/var-dumper v2.7.12|install symfony/var-dumper v2.7.13|instal
l symfony/var-dumper v2.7.14|install symfony/var-dumper v2.7.15|install symfony/var-dumper v2.7.16|install symfony/var-dumper v2.7.17|install symfony/var-dumper v2.7.18|install symfony/var-dumper v2.7.19|install symfony/var-dumper v2.7.2|install symfony/var-dumper
v2.7.20|install symfony/var-dumper v2.7.21|install symfony/var-dumper v2.7.22|install symfony/var-dumper v2.7.23|install symfony/var-dumper v2.7.24|install symfony/var-dumper v2.7.25|install symfony/var-dumper v2.7.26|install symfony/var-dumper v2.7.27|install symf
ony/var-dumper v2.7.28|install symfony/var-dumper v2.7.29|install symfony/var-dumper v2.7.3|install symfony/var-dumper v2.7.30|install symfony/var-dumper v2.7.31|install symfony/var-dumper v2.7.32|install symfony/var-dumper v2.7.33|install symfony/var-dumper v2.7.3
4|install symfony/var-dumper v2.7.35|install symfony/var-dumper v2.7.36|install symfony/var-dumper v2.7.37|install symfony/var-dumper v2.7.38|install symfony/var-dumper v2.7.39|install symfony/var-dumper v2.7.4|install symfony/var-dumper v2.7.40|install symfony/var
-dumper v2.7.41|install symfony/var-dumper v2.7.42|install symfony/var-dumper v2.7.43|install symfony/var-dumper v2.7.44|install symfony/var-dumper v2.7.45|install symfony/var-dumper v2.7.46|install symfony/var-dumper v2.7.47|install symfony/var-dumper v2.7.48|inst
all symfony/var-dumper v2.7.49|install symfony/var-dumper v2.7.5|install symfony/var-dumper v2.7.50|install symfony/var-dumper v2.7.6|install symfony/var-dumper v2.7.7|install symfony/var-dumper v2.7.8|install symfony/var-dumper v2.7.9|install symfony/var-dumper v2
.8.0|install symfony/var-dumper v2.8.0-BETA1|install symfony/var-dumper v2.8.1|install symfony/var-dumper v2.8.10|install symfony/var-dumper v2.8.11|install symfony/var-dumper v2.8.12|install symfony/var-dumper v2.8.13|install symfony/var-dumper v2.8.14|install sym
fony/var-dumper v2.8.15|install symfony/var-dumper v2.8.16|install symfony/var-dumper v2.8.17|install symfony/var-dumper v2.8.18|install symfony/var-dumper v2.8.19|install symfony/var-dumper v2.8.2|install symfony/var-dumper v2.8.20|install symfony/var-dumper v2.8.
21|install symfony/var-dumper v2.8.22|install symfony/var-dumper v2.8.23|install symfony/var-dumper v2.8.24|install symfony/var-dumper v2.8.25|install symfony/var-dumper v2.8.26|install symfony/var-dumper v2.8.27|install symfony/var-dumper v2.8.28|install symfony/v
ar-dumper v2.8.29|install symfony/var-dumper v2.8.3|install symfony/var-dumper v2.8.30|install symfony/var-dumper v2.8.31|install symfony/var-dumper v2.8.32|install symfony/var-dumper v2.8.33|install symfony/var-dumper v2.8.34|install symfony/var-dumper v2.8.35|ins
tall symfony/var-dumper v2.8.36|install symfony/var-dumper v2.8.37|install symfony/var-dumper v2.8.38|install symfony/var-dumper v2.8.39|install symfony/var-dumper v2.8.4|install symfony/var-dumper v2.8.40|install symfony/var-dumper v2.8.41|install symfony/var-dump
er v2.8.42|install symfony/var-dumper v2.8.43|install symfony/var-dumper v2.8.44|install symfony/var-dumper v2.8.45|install symfony/var-dumper v2.8.46|install symfony/var-dumper v2.8.47|install symfony/var-dumper v2.8.48|install symfony/var-dumper v2.8.49|install s
ymfony/var-dumper v2.8.5|install symfony/var-dumper v2.8.6|install symfony/var-dumper v2.8.7|install symfony/var-dumper v2.8.8|install symfony/var-dumper v2.8.9|install symfony/var-dumper v3.0.0|install symfony/var-dumper v3.0.0-BETA1|install symfony/var-dumper v3.
0.1|install symfony/var-dumper v3.0.2|install symfony/var-dumper v3.0.3|install symfony/var-dumper v3.0.4|install symfony/var-dumper v3.0.5|install symfony/var-dumper v3.0.6|install symfony/var-dumper v3.0.7|install symfony/var-dumper v3.0.8|install symfony/var-dum
per v3.0.9|install symfony/var-dumper v3.1.0|install symfony/var-dumper v3.1.0-BETA1|install symfony/var-dumper v3.1.0-RC1|install symfony/var-dumper v3.1.1|install symfony/var-dumper v3.1.10|install symfony/var-dumper v3.1.2|install symfony/var-dumper v3.1.3|insta
ll symfony/var-dumper v3.1.4|install symfony/var-dumper v3.1.5|install symfony/var-dumper v3.1.6|install symfony/var-dumper v3.1.7|install symfony/var-dumper v3.1.8|install symfony/var-dumper v3.1.9|install symfony/var-dumper v3.2.0|install symfony/var-dumper v3.2.
0-BETA1|install symfony/var-dumper v3.2.0-RC1|install symfony/var-dumper v3.2.0-RC2|install symfony/var-dumper v3.2.1|install symfony/var-dumper v3.2.10|install symfony/var-dumper v3.2.11|install symfony/var-dumper v3.2.12|install symfony/var-dumper v3.2.13|install
 symfony/var-dumper v3.2.14|install symfony/var-dumper v3.2.2|install symfony/var-dumper v3.2.3|install symfony/var-dumper v3.2.4|install symfony/var-dumper v3.2.5|install symfony/var-dumper v3.2.6|install symfony/var-dumper v3.2.7|install symfony/var-dumper v3.2.8
|install symfony/var-dumper v3.2.9
    - drupal/devel 2.x-dev requires symfony/var-dumper ~2.7|^3 -> satisfiable by symfony/var-dumper[2.7.x-dev, 2.8.x-dev, 3.0.x-dev, 3.1.x-dev, 3.2.x-dev, 3.3.x-dev, 3.4.x-dev, v2.7.0, v2.7.0-BETA1, v2.7.0-BETA2, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14,
 v2.7.15, v2.7.16, v2.7.17, v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.21, v2.7.22, v2.7.23, v2.7.24, v2.7.25, v2.7.26, v2.7.27, v2.7.28, v2.7.29, v2.7.3, v2.7.30, v2.7.31, v2.7.32, v2.7.33, v2.7.34, v2.7.35, v2.7.36, v2.7.37, v2.7.38, v2.7.39, v2.7.4, v2.7.40, v2.7.4
1, v2.7.42, v2.7.43, v2.7.44, v2.7.45, v2.7.46, v2.7.47, v2.7.48, v2.7.49, v2.7.5, v2.7.50, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.0-BETA1, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8
.21, v2.8.22, v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.28, v2.8.29, v2.8.3, v2.8.30, v2.8.31, v2.8.32, v2.8.33, v2.8.34, v2.8.35, v2.8.36, v2.8.37, v2.8.38, v2.8.39, v2.8.4, v2.8.40, v2.8.41, v2.8.42, v2.8.43, v2.8.44, v2.8.45, v2.8.46, v2.8.47, v2.8.48, v
2.8.49, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.0.7, v3.0.8, v3.0.9, v3.1.0, v3.1.0-BETA1, v3.1.0-RC1, v3.1.1, v3.1.10, v3.1.2, v3.1.3, v3.1.4, v3.1.5, v3.1.6, v3.1.7, v3.1.8, v3.1.9, v3.2.0,
v3.2.0-BETA1, v3.2.0-RC1, v3.2.0-RC2, v3.2.1, v3.2.10, v3.2.11, v3.2.12, v3.2.13, v3.2.14, v3.2.2, v3.2.3, v3.2.4, v3.2.5, v3.2.6, v3.2.7, v3.2.8, v3.2.9, v3.3.0, v3.3.0-BETA1, v3.3.0-RC1, v3.3.1, v3.3.10, v3.3.11, v3.3.12, v3.3.13, v3.3.14, v3.3.15, v3.3.16, v3.3.
17, v3.3.18, v3.3.2, v3.3.3, v3.3.4, v3.3.5, v3.3.6, v3.3.7, v3.3.8, v3.3.9, v3.4.0, v3.4.0-BETA1, v3.4.0-BETA2, v3.4.0-BETA3, v3.4.0-BETA4, v3.4.0-RC1, v3.4.0-RC2, v3.4.1, v3.4.10, v3.4.11, v3.4.12, v3.4.13, v3.4.14, v3.4.15, v3.4.16, v3.4.17, v3.4.18, v3.4.19, v3
.4.2, v3.4.20, v3.4.21, v3.4.3, v3.4.4, v3.4.5, v3.4.6, v3.4.7, v3.4.8, v3.4.9].
    - Can only install one of: symfony/var-dumper[3.3.x-dev, v4.2.2].
    - Can only install one of: symfony/var-dumper[3.4.x-dev, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.0, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.0-BETA1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.0-RC1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.10, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.11, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.12, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.13, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.14, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.15, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.16, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.17, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.18, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.2, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.3, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.4, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.5, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.6, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.7, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.8, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.3.9, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-BETA1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-BETA2, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-BETA3, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-BETA4, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-RC1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.0-RC2, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.1, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.10, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.11, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.12, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.13, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.14, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.15, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.16, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.17, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.18, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.19, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.2, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.20, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.21, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.3, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.4, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.5, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.6, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.7, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.8, v4.2.2].
    - Can only install one of: symfony/var-dumper[v3.4.9, v4.2.2].
    - Installation request for symfony/var-dumper (locked at v4.2.2) -> satisfiable by symfony/var-dumper[v4.2.2].


Installation failed, reverting ./composer.json to its original content.
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Comments

Cybercraft2003 created an issue. See original summary.

lussoluca’s picture

Status: Active » Needs review
FileSize
316 bytes

Could you please try with this patch?

Cybercraft2003’s picture

The patch is apply after the module installation.
In my case, i can apply the patch because i can install the module.

I think is the right solution but the patch must be merge in the module.

moshe weitzman’s picture

I think we need to support 2,3,4. The patch supports only 2 and 4, right?

Cybercraft2003’s picture

Nope, the patch support from 2.7 to 4. For me, the patch is right

Daniel.Moberly’s picture

Title: Composer dependency symfony/var-dumper » Composer symfony/var-dumper requirement conflicts with core
FileSize
319 bytes

Yep - same issue here. Core requires ^4.2. Attaching a patch which supports v3 as well

drupal-composer/drupal-project dev-master requires symfony/var-dumper (^4.2)

Changing title to reflect issue.

lussoluca’s picture

Status: Needs review » Needs work

It seems strange to my that Core requires a package from Symfony 4...
I've just tried on a new 8.6.7 and Composer are able to compute and download all dependencies correctly

Daniel.Moberly’s picture

Status: Needs work » Needs review

Are you installing Drupal using composer?

https://www.drupal.org/docs/develop/using-composer/using-composer-to-man...

composer why symfony/var-dumper
drupal-composer/drupal-project  dev-master  requires  symfony/var-dumper (^4.2)
lussoluca’s picture

Yes, but without drupal-composer/drupal-project

composer why symfony/var-dumper
drupal/devel 2.0.0 requires symfony/var-dumper (~2.7|^3)
drush/drush 9.5.2 requires symfony/var-dumper (^3.4)
psy/psysh v0.9.9 requires symfony/var-dumper (~2.7|~3.0|~4.0)

Daniel.Moberly’s picture

Well per the Drupal.org documentation drupal-composer/drupal-project is the recommended way to install Drupal using composer, so it seems pretty important to support it with Devel, no?

https://www.drupal.org/docs/develop/using-composer/using-composer-to-man...

lussoluca’s picture

I've just tried:

$ composer create-project drupal-composer/drupal-project:8.x-dev my_site_name_dir --no-interaction

$ composer why symfony/var-dumper
drush/drush 9.5.2 requires symfony/var-dumper (^3.4)
psy/psysh v0.9.9 requires symfony/var-dumper (~2.7|~3.0|~4.0)

$ composer require drupal/devel:2.0

and all works correctly.

We need to understand why on your system you have the 4.2 version of var-dumper (when Drupal Core is on Symfony 3 at the moment)

mass5’s picture

I tried #11 on my end and no luck. I get the same error...
Installation failed, reverting ./composer.json to its original content.

PieterDC’s picture

Also can't update.

This is the output of composer why on my installation:

$ composer why symfony/var-dumper
psy/psysh  v0.9.9  requires  symfony/var-dumper (~2.7|~3.0|~4.0)

Haven't tried any suggestion from this issue (yet).
Not upgrading for now.

5n00py’s picture

I can't install devel via
$ composer require drupal/devel

...
Installation request for symfony/var-dumper (locked at v4.2.2) -> satisfiable by symfony/var-dumper[v4.2.2].

And after updating composer.json manually, and run composer update I have:

  - Removing symfony/polyfill-php72 (v1.10.0)
  - Removing consolidation/filter-via-dot-access-data (1.0.0)
  - Removing consolidation/site-process (1.1.0)
  - Downgrading symfony/var-dumper (v4.2.2 => v3.4.21): Downloading (100%)
  - Downgrading consolidation/site-alias (2.1.1 => 1.1.11): Downloading (100%)
  - Downgrading drush/drush (9.6.0-rc2 => 9.5.2): Downloading (100%)
  - Installing drupal/devel (2.0.0): Downloading (100%)

So currently devel is incompatible with drush 9.6

dkrockville’s picture

I have the same problem. Can we get a resolution as soon as possible, or at least a workaround?
I have removed/uninstalled devel 1. New version 2 will not install. Using composer require 'drupal/devel:^2.0'

Problem 1
    - Conclusion: don't install drupal/devel 2.0.0
    - Conclusion: remove symfony/http-kernel v3.4.21
    - Conclusion: don't install symfony/http-kernel v3.4.21
Daniel.Moberly’s picture

Here's the workaround I used for now:

Open composer.json

Change the "require" "symfony/var-dumper" line to
"symfony/var-dumper": "^2.0|^3.0|^4.0",

And the drupal/devel line to
"drupal/devel": "^2.0",

And the drush line to
"drush/drush": "^9.5",

Run composer update and it should downgrade your drush and update your devel.

lussoluca’s picture

Ok, let's Devel be compatibile with Drush 9.6

dkrockville’s picture

After composer require drupal/devel, the dev version was installed. The attempt to enable the devel module returned this error:

Unable to install Devel, devel.settings, devel.toolbar.settings, system.menu.devel already exist in active configuration

Cybercraft2003’s picture

I've try the new patch commited with simply :

$>composer require drupal/devel:^2

All is right ! Thx

mmjvb’s picture

Sounds like a support request to me!
Requesting support for symfony/var-dumper:^4
Nothing to do with core, drupal-composer/drupal-project.

Just a matter of standard dependency management. When requirements change, they can conflict with existing situation. That is why there is a --with-dependencies and --with-all-dependencies option with composer. When composer require gives a conflict you can use --no-update followed by composer update. That will resolve all dependencies with the new set of requirements.

When the composer update reports conflicts you need to verify your requirements. Are the version constraints appropriate? When set too tight, you might loosen them up. Not convinced that just adding ^4 to the list was the right thing to do. Just because drush 9.6 supports ^4, that doesn't mean devel supports it. Yes, it solves it for that particular project. But, so does staying with ^3. It just requires them to do the right thing.

featherbelly’s picture

@mmjvb - is this what you mean?

composer require drupal/devel:^2.0.0 --no-update
composer update

mmjvb’s picture

Yes, that is what I meant.

moshe weitzman’s picture

Status: Needs review » Fixed

Looks fixed in #17

ahebrank’s picture

To summarize above: if you're reading this, you probably have var-dumper 4 because it's the highest version drush currently supports (https://github.com/drush-ops/drush/blob/master/composer.json#L52; see their reasoning at https://github.com/drush-ops/drush/pull/3578).

The dev version of devel now allows var-dumper 4 (https://git.drupalcode.org/project/devel/blob/8.x-2.x/composer.json#L42), but you should also be able to bring in devel:2.0 stable with:

composer require drupal/devel:2.0 --no-update && composer update

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.

leisurman’s picture

#22 and #25 works for me.