Multi-assignment statement in "setup" block does not compile

Originally reported on Google Code with ID 373

I have a "setup" block in my test with the following code:
        def (parentGroupId, childGroupId1, childGroupId2) = createGroupWithAssociations()

The method being invoked returns a List of three items. When I try to run the test
I get the following compilation error:
    java.lang.ClassCastException: org.codehaus.groovy.ast.expr.ArgumentListExpression
cannot be cast to org.codehaus.groovy.ast.expr.VariableExpression
        at org.codehaus.groovy.ast.expr.DeclarationExpression.getVariableExpression(DeclarationExpression.java:100)
        at org.spockframework.compiler.SpecRewriter.moveVariableDeclarations(SpecRewriter.java:538)
...

See attachment for full stacktrace.


When I rewrite the code so that it doesn't use Groovy's multi-assignment, the test
compiles and passes fine:
        def groupIds = createGroupWithAssociations()
        def parentGroupId = groupIds[0]
        def childGroupId1 = groupIds[1]
        def childGroupId2 = groupIds[2]



Using Grails 2.3.8 and thus:
=> spock-core:0.7-groovy-2.0
=> groovy-all:2.1.9

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Reported by vpaziran on 2014-08-14 21:55:32

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- _Attachment: [spock-compile-error-groovy-multi-assignment-not-working.txt](https://storage.googleapis.com/google-code-attachments/spock/issue-373/comment-0/spock-compile-error-groovy-multi-assignment-not-working.txt)_

Start by reproducing the setup-block example with spock-core 0.7-groovy-2.0 and groovy-all 2.1.9, then follow the reported stack trace through SpecRewriter.moveVariableDeclarations and DeclarationExpression.getVariableExpression. Done means the multi-assignment compiles and the test passes without the ClassCastException.