[GROOVY-4767] Compilation error for generic interface method - ASF JIRA

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Repro:

Compile

interface Foo {
    public <N extends Number> void foo()
}

Result:

unexpected token: public @ line 2, column 5.
       public <N extends Number> void foo()
       ^

Making Foo an abstract class avoids the problem:

abstract class Foo {
    public abstract <N extends Number> void foo()
}

is depended upon by

GROOVY-4908 Improved compiler checking/error messages required when checking interfaces with generics