bug: CtTypeReference for a non-generic type is filled with type parameters

[sibwaf]

Calling CtExecutable#getExecutableDeclaration() somehow manages to add a type parameter to the java.lang.Object type reference in a TypeFactory. And, well, java.lang.Object shouldn't have any generics.

This problem could be somehow connected to this line (contexts.peek() happens to be the said type reference), but I'm not too sure. Further investigation is a bit too much for me, sorry.

Code to reproduce. Just import the Gradle project and launch Main class. To get the stacktrace put a breakpoint on the System.out.println("Type parameters before ...");.
The used Spoon version is 8.4.0-beta-8, but it's reproducible at least since this commit.

[andrewbwogi]

I'm taking a look at this.