Add tests for function parameter/return unboxing #2321
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This PR adds some tests following #1271 .
These tests actually show that #2319 missed one spot when it renamed the attribute.
Also, it appears that the location of the warning is not always exact: indeed, as can be show in the compilers reference for the added tests, we have two warnings as expected, but both quote the same location, which is less than ideal since this means we cannot distinguish the warning for the annotation on the parameter from the warning on the annotation of the function return, cc @Ekdohibs .