[GROOVY-10659] Parrot Parser: named arguments does not support all key expressions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.12, 4.0.4
• Component/s: parser-antlr4
• Assignee: Daniel Sun
• Reporter: Michal Ševčenko
• Created: 17/Jun/22 10:08
• Updated: 23/Jul/22 21:05
• Resolved: 02/Jul/22 04:35

Description

This is IMO a regression (wrt. e.g. Groovy 2.4.11), the following does not compile in Groovy 3.0.10.

def fun = { arg ->
    return arg
}

fun (
    x: 1,
    [a: 1]: '2'
)

This is the combination of the following:

• map literal is used as an argument of a function, without enclosing brackets (I hope this  is legal)
• another map literal is used as a key of the outer map (I hope this is legal too)

If both these preconditions are met, the compiler complains with:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
index.groovy: 5: Unexpected input: '(' @ line 5, column 5.
   fun (
       ^
1 error 

This does compile:

def fun = { arg ->
    return arg
}

fun (
    x: 1,
    a: '2'
)

So does this:

def fun = { arg ->
    return arg
}

fun ([
    x: 1,
    [a: 1]: '2'
]) 

Is this a bug?