Have Name 8.x-1.0-beta1 module installed. Making the name field unique causes the site to error out on save.
Issue fork unique_field-2842796
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Comment #2
astonvictor commentedComment #3
nnevillComment #5
nnevillMR above adds support for the name module.
Comment #6
nnevillComment #7
astonvictor commentedit should also work for user and term validations
unique_field_form_validate() is a validation callback for nodes only