Parse method is "already defined" due to non-terminal labels?

[jurgenvinju]

I ran into this error because of a stupid copy-and-paste error: Statement -> _with: 'WITH' "(" {Shorthand shorthand ","}+ ")" Eol ignore StatementBlock body 'ENDWITH' This results in a cryptic "method Shorthand() is already defined" error. Of course the fix is easy: Statement -> _with: 'WITH' "(" {Shorthand ","}+ shorthands ")" Eol ignore StatementBlock body 'ENDWITH'

Originally posted by @PieterOlivier in https://github.com/usethesource/rascal/issues/901#issuecomment-1100820959

[jurgenvinju]

I have some clarification questions before I can triage this bug. @PieterOlivier, did the following happen:

1. You had {Shorthand shorthand ","}+ in your rule and that resulted "method already defined" compilation errors?
2. You changed it to {Shorthand ","}+ shorthands and the bug dissappeared?

[PieterOlivier]

1. Yes
2. Yes

[jurgenvinju]

One more question, is there another rule that contains Shorthand shorthand as a symbol in the grammar? and if so, what does it look like?

[jurgenvinju]

oeps. wrong issue number in commit.