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https://issues.apache.org/jira/browse/GROOVY-11601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17941476#comment-17941476
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Paul King commented on GROOVY-11601:
------------------------------------
So, for clarity, A would be allowed but B, C, D no longer.
{code:groovy}
// A
def items = []
for (int i = 3, j = 70; i < 8; i++, j -= 10) {
items << i + j
}
assert items == [73, 64, 55, 46, 37]
// B
for ({ List items2 = []; int i = 3; long j = 70 }(); i < 8; i++, j -= 10) {
// note multiple types
items2 << i + j
}
assert items2 == [73, 64, 55, 46, 37]
// C
items.clear()
for (int i = 3, j = 70; { println i; i < 8 }(); i++, j -= 10) { // prints 3
-> 8
items << i + j
}
assert items == [73, 64, 55, 46, 37]
// D
items.clear()
for ((i, j)=[3, 70]; i < 8; { i++; j -= 10; println '*' }()) { // prints *
five times
items << i + j
}
assert items == [73, 64, 55, 46, 37]
{code}
I think it is worth keeping. It worries me that we don't have any tests cases
covering these cases.
> remove support for expression list in for-each statement
> --------------------------------------------------------
>
> Key: GROOVY-11601
> URL: https://issues.apache.org/jira/browse/GROOVY-11601
> Project: Groovy
> Issue Type: Improvement
> Components: parser-antlr4
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Minor
>
> The for-each loop supports an arbitrary expression list. Presumably this is
> for legacy reasons. Now that multi-variable declaration is supported by
> for-each and classic for, it does not seem necessary to support expression
> list. I propose to remove it from the parser grammar.
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