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https://issues.apache.org/jira/browse/GROOVY-8625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498796#comment-16498796
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Jochen Theodorou commented on GROOVY-8625:
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The point here is that Alexander would like to have # and others as part of the
identifier. After such a change println "$first#$second" would no longer yield
hello#world. You may want for example write 20°C in a DSL, but you cannot,
because ° is not accepted
> Groovy Lexer does not accept UTF-8 characters like ° or § ... and a lot more
> ----------------------------------------------------------------------------
>
> Key: GROOVY-8625
> URL: https://issues.apache.org/jira/browse/GROOVY-8625
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 2.5.0
> Reporter: Alexander Klein
> Priority: Major
> Labels: compiler, grammar, lexer
>
> The grammar uses a similar specification for LETTERs as the old Java-grammar.
> By intention most UTF-8 characters should possible to use for names to enable
> localization in languages using non-latin characters. This is especially
> important for DSLs.
> Ast-transformations will take place after the Lexer. With the Lexer accepting
> his characters, ast-transformations are now able to handle more things like
> creating custom operators and so on.
> This is a problem only for ANTLR 2.
> ANTLR 4 is only missing the '#'-sign.
> This maybe introduces a breaking change, because GStrings like
> "$first#$second" worked in the past, and now will not anymore. Before this
> change, "$first#" is interpreted as the value of the variable first plus a
> '#' sign. Now it is interpreted as the value of the variable first#.
> This, of cause, is a problem for all newly added letters.
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