Missing test for docstring-handling code in ast_opt.c

[iritkatriel]

astfold_body has a block of code that checks whether const folding created something that looks like a docstring, which was not there before. If it did, then we have a string that came out of folding a const expression. This is not recognised by Python as a docstring, so in order to prevent the compiler from recognising it as such, the astfold_body converts the AST node into a const f-string node (_PyAST_JoinedStr), which is also not recognised as a docstring.

This is not covered by tests, so it took me a while to figure out what's going on. I'll add the test.

Linked PRs

• gh-123942: add missing test for docstring-handling code in ast_opt.c #123943
• [3.13] gh-123942: add missing test for docstring-handling code in ast_opt.c (GH-123943) #123955