AbiCompatibility Check(string before, string after)
{
IProjectContent oldPctx, newPctx;
SyntaxTree tree;
ICSharpCode.NRefactory.CSharp.TypeSystem.CSharpUnresolvedFile file;
CodeCompletionBugTests.CreateCompilation(before, out oldPctx, out tree, out file, false);
CodeCompletionBugTests.CreateCompilation(after, out newPctx, out tree, out file, false);
return(new AbiComparer().Check(oldPctx.CreateCompilation(), newPctx.CreateCompilation()));
}