Minor Bug Fix Release

ANTLR 4.2.1 is a minor bugfix update to ANTLR 4. This update is source- and binary-compatible with ANTLR 4.2. Users updating from earlier versions are encouraged to read the release notes for ANTLR 4.2.

Documentation

Please see the latest release for links to the current documentation.

Summary of Changes

You can view all issues closed for this release here, and all commits for this release here.

Bug Fixes

• Fix the ParserRuleContext which is returned by the parser interpreter when parsing starts with a left-recursive rule (#461)
• Fix the accessor methods generated for rules where multiple alternatives use the same label (#433)
• Add new warning and error messages to help users (#472, #489, #500)
• Fix lexer action execution in the middle of rules (#469)
• Fix bug in adaptivePredict for certain left recursive rules (#509)
• Other smaller fixes (#474, #495)