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https://issues.apache.org/jira/browse/GROOVY-11335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-11335.
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Fix Version/s: 5.0.0-alpha-7
Resolution: Fixed
https://github.com/apache/groovy/commit/5e03289d257ed2870225706797f3522df1b6662a
> STC: for loop element type inference with multiple instanceof
> -------------------------------------------------------------
>
> Key: GROOVY-11335
> URL: https://issues.apache.org/jira/browse/GROOVY-11335
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.0-alpha-7
>
>
> Consider the following:
> {code:groovy}
> @groovy.transform.TypeChecked
> void test(obj) {
> if (obj instanceof Collection) {
> if (obj instanceof Serializable) {
> for (item in obj) {
> println item
> }
> }
> }
> }
> {code}
> The inferred type of "obj" is (Collection & Serializable). The loop element
> check fails with:
> {code}
> java.lang.UnsupportedOperationException
> at
> org.codehaus.groovy.transform.stc.UnionTypeClassNode.getComponentType(UnionTypeClassNode.java:232)
> at
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.inferLoopElementType(StaticTypeCheckingVisitor.java:2042)
> at
> org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitForLoop(StaticTypeCheckingVisitor.java:2008)
> at org.codehaus.groovy.ast.stmt.ForStatement.visit(ForStatement.java:47)
> {code}
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