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https://issues.apache.org/jira/browse/GROOVY-11744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016090#comment-18016090
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Paul King commented on GROOVY-11744:
------------------------------------
I expect it to work without @CompileStatic:
{noformat}
$ cat main.groovy
def main() {
def (_, y, _) = [3, 4, 5]
println _ // 5, last usage
println GroovySystem.version
}
$ ~/Developer/groovy-5.0.0/bin/groovy main.groovy
5
5.0.0
{noformat}
But with @CompileStatic I expect the compilation error:
{noformat}
$ vi main.groovy
$ cat main.groovy
@groovy.transform.CompileStatic
def main() {
def (_, y, _) = [3, 4, 5]
println _ // 5, last usage
println GroovySystem.version
}
$ ~/Developer/groovy-5.0.0/bin/groovy main.groovy
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/private/tmp/main.groovy: 4: [Static type checking] - The variable [_] is
undeclared.
@ line 4, column 11.
println _ // 5, last usage
^
1 error
{noformat}
> Unnamed variables are actually used
> -----------------------------------
>
> Key: GROOVY-11744
> URL: https://issues.apache.org/jira/browse/GROOVY-11744
> Project: Groovy
> Issue Type: Bug
> Reporter: Georgii Ustinov
> Priority: Major
>
> I am currently implementing Groovy 5 support inside Intellij IDEA and
> encountered the following behaviour. Consider the following code:
> {code:java}
> package org.example.demo
> static void main(String[] args) {
> def _ = 1
> def (_, _) = [2, 3]
> println _
> } {code}
> I expected that it will print 1, since variable declaration contains only
> unnamed variables.
> Actually it prints 3. The same behaviour can be encountered here:
> {code:java}
> def _ = 1
> def x = (_, _) -> {
> println(_)
> }
> x(2, 3){code}
> I beileve this is a bug.
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