[GROOVY-7032] Traits don't like generic arguments - ASF JIRA

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This compiles:

trait Foo { public <T> T  bar(def a) { a } }
class Bar implements Foo {}

This doesn't:

trait Foo { public <T> T  bar(T a) { a } }
class Bar implements Foo {}

But this does:

trait Foo<X> { public <T> T  bar(T a) { a } }
class Bar implements Foo {}

But this doesn't:

trait Foo<X> { public <T> T  bar(T a) { a } }
class Bar implements Foo<String> {}

This does, though it doesn't make sense:

trait Foo<X> { public <T> T  bar(X a) { a } }
class Bar implements Foo<String> {}