If a nested function uses a variably-modified structure or union type
that depends on the enclosing context, it needs the static chain.
My recent change missed this, because in this case no decl was used.
To address this, we now call mark_decl_used also on TYPE_STUB_DECLs.
PR c/124985
gcc/c/ChangeLog:
* c-decl.cc (pushtag): Update comment.
(declspecs_add_type): Mark TYPE_STUB_DECL as used.
* c-typeck.cc (function_to_pointer_conversion): Fix grammar in comment.
gcc/testsuite/ChangeLog:
* gcc.dg/Wreturn-nested-3.c: New test.
* gcc.dg/pr124985.c: New test.
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