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https://issues.apache.org/jira/browse/GROOVY-9232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16911972#comment-16911972
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Yuli Zhan commented on GROOVY-9232:
-----------------------------------
Closing this issue because the groovy project is using the optimized fork of
antlr4, which only support java target.
> Failed to create parser from .g4 files using official ANTLR4.7.2
> ----------------------------------------------------------------
>
> Key: GROOVY-9232
> URL: https://issues.apache.org/jira/browse/GROOVY-9232
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 3.0.0-beta-3
> Reporter: Yuli Zhan
> Priority: Minor
>
> I was trying to generate a parser from _GroovyLexer.g4_ and _GroovyParser.g4_
> using the official distribution of ANTLR4 (4.7.2). However, the following
> error was thrown:
> {code:java}
> > antlr -Dlanguage=Go -o parser groovy/GroovyParser.g4
>
> warning(83): groovy/GroovyParser.g4:342:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:374:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:379:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:479:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:489:10: unsupported option baseContext
> error(123): groovy/GroovyParser.g4:788:93: rule alt label castExprAlt
> redefined in rule expression, originally in rule castOperandExpression
> error(123): groovy/GroovyParser.g4:789:93: rule alt label postfixExprAlt
> redefined in rule expression, originally in rule castOperandExpression
> error(123): groovy/GroovyParser.g4:792:93: rule alt label unaryNotExprAlt
> redefined in rule expression, originally in rule castOperandExpression
> error(123): groovy/GroovyParser.g4:798:93: rule alt label unaryAddExprAlt
> redefined in rule expression, originally in rule castOperandExpression
> warning(83): groovy/GroovyParser.g4:883:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:1118:10: unsupported option baseContext
> warning(83): groovy/GroovyParser.g4:1133:10: unsupported option
> baseContext{code}
>
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