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https://issues.apache.org/jira/browse/GROOVY-10371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-10371.
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Fix Version/s: 5.0.0-alpha-12
Resolution: Fixed
https://github.com/apache/groovy/blob/71490fbbc2dc63cdaa70b2f61b77f7f5f94b82af/src/test/groovy/transform/stc/GenericsSTCTest.groovy#L1949
> STC involves improper subtyping rules for parameterized types with wildcard
> types
> ---------------------------------------------------------------------------------
>
> Key: GROOVY-10371
> URL: https://issues.apache.org/jira/browse/GROOVY-10371
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 5.0.0-alpha-12
>
>
> The following program should not type check
> {code:java}
> class A<T> {}
> class B<T> extends A<T> {}
> class Test {
> B<? extends Number> x = new B<Double>();
> A<Number> y = x;
> }
> {code}
> h3. Expected behaviour
> the compiler should have rejected the program and produced an error of the
> form (like javac does):
> {code}
> error: incompatible types: B<CAP#1> cannot be converted to A<Number>
> A<Number> y = x;
> ^
> where CAP#1 is a fresh type-variable:
> CAP#1 extends Number from capture of ? extends Number
> 1 error
> {code}
> Tested against master
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