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https://issues.apache.org/jira/browse/GROOVY-10324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-10324.
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> STC is unable to infer type variable when combining parameterized types and
> the diamond operator
> ------------------------------------------------------------------------------------------------
>
> Key: GROOVY-10324
> URL: https://issues.apache.org/jira/browse/GROOVY-10324
> Project: Groovy
> Issue Type: Bug
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-beta-2
>
>
> I have the following program
> {code:java}
> class A {
> <T> T foo(C<T> t) { return null; }
> }
> class C<T> {}
> class B {
> void test() {
> C<String> x = (new A()).foo(new C<>());
> }
> }
> {code}
> h3. Actual behaviour
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> test.groovy: 12: [Static type checking] - Cannot assign value of type
> java.lang.Object to variable of type C<java.lang.String>
> @ line 12, column 19.
> C<String> x = (new A()).foo(new C<>());
> ^
> 1 error
> {code}
> h3. Expected behaviour
> Compile successfully
> Note that compilation fails only if the expected return type is parameterized
> (i.e., `D<String>`). If I replace the declared type of `x` with a regular
> type (i.e., `String`), the code compiles fine.
> Tested against master.
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