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https://issues.apache.org/jira/browse/GROOVY-10724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17945229#comment-17945229
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Paul King commented on GROOVY-10724:
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Workarounds for: (a) in [2, 3, 4]
{code:groovy}
def b2 = a in [2, 3, 4]
def b3 = ((a)) in [2, 3, 4]
def b4 = [2, 3, 4].isCase(a)
def b5 = [2, 3, 4].isCase((a))
def b6 = [2, 3, 4].contains(a)
def b7 = [2, 3, 4].contains((a))
assert [b2, b3, b4, b5, b6, b7].every()
{code}
Workarounds for: (a) as Integer
{code:groovy}
def c2 = a as Integer
def c3 = ((a)) as Integer
def c4 = (a).asType(Integer)
def c5 = (Integer)(a)
[c2, c3, c4, c5].every { assert it == 3 }
{code}
Workarounds for: (a) +2 // unary plus
{code:groovy}
def d2 = a +2
def d3 = ((a)) +2
def d4 = (a).plus(2)
[d2, d3, d4].every { assert it == 5 }
{code}
Workarounds for: (a) -1 // unary minus
{code:groovy}
def e2 = a -1
def e3 = ((a)) -1
def e4 = (a).minus(2)
[e2, e3, e4].every { assert it == 2 }
{code}
> Parrot parser incorrectly treats an expression wrapped in parentheses as a
> cast
> -------------------------------------------------------------------------------
>
> Key: GROOVY-10724
> URL: https://issues.apache.org/jira/browse/GROOVY-10724
> Project: Groovy
> Issue Type: Bug
> Components: parser-antlr4
> Affects Versions: 3.0.12
> Reporter: Marcin Erdmann
> Priority: Major
>
> Trying to compile this code:
> {code:java}
> def a = ""
> (a) in []
> {code}
> results in
> {code:java}
> /path/to/file/Foo.groovy: 10: unable to resolve class a
> @ line 21, column 9.
> (a) in []
> ^
> 1 error
> {code}
> Obviously the parentheses are not necessary and the problem goes away if you
> drop them but it would be good if that code was still allowed like it was in
> 2.5 or if at least the error wasn't so confusing.
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