Only variables should passed by reference errors

I was trying to use coder_upgrade on a module but got ran into a bunch of errors with grammar_parser. I'm guessing it's because I'm using PHP 5.3.

ERROR: Only variables should be passed by reference on line 1310 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 1311 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 1372 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 1830 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 1924 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 1944 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2005 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2221 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2232 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2233 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2799 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2800 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2807 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2828 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc
ERROR: Only variables should be passed by reference on line 2831 in /Users/amorton/Sites/d7/sites/all/modules/grammar_parser/engine/grammar_parser.reader.inc