[mypyc] Generate introspection signatures for compiled functions #19307
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Refs mypyc/mypyc#838
This PR populates
__text_signature__for compiled functions, making runtime signature introspection possible (i.e.inspect.signature(func)).While
__text_signature__is an undocumented CPython implementation detail, other extension module generators are using it in practice. For example, PyO3 and Cython both support it. I think it would be reasonable for mypyc to support it too.Some function signatures can't be represented by
__text_signature__(namely, those with complex default arguments). In those cases, no signatures are generated (same as the current behavior).