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Right now `TEMPLATE_TEST_CASE_SIG` fails to compile when the signature contains only types: ``` TEMPLATE_TEST_CASE_SIG( "TemplateTestSig: compiles with two type parameters", "[template][onlytypes]", ((typename U, typename V), U, V), (int,int)) {} ``` The trick is to resolve the ambiguity between the two overloads of `get_wrapper` (`TypeList` and `Nttp`) by making one match more strongly. We also need to allow `reg_test` to register more than one type. Add unit tests. Fixes #2680 --------- Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>