‘signal’ no longer returns
Although for decades ‘signal’ has been documented to not return, a corner case in the Lisp debugger causes ‘signal’ to return. Remove the corner case and adjust Emacs internals accordingly. An alternative would be to document the corner case, but this would complicate the Lisp API unnecessarily. (Bug#24047) * src/eval.c (signal_or_quit): New function, with most of the old contents of Fsignal. (quit): New function, which uses signal_or_quit and which might return. All keyboard-based callers of Fsignal (Qquit, Qnil) changed to use this new function instead. (Fsignal): Use signal_or_quit. Now _Noreturn. All callers changed. (xsignal): Move to lisp.h. * src/lisp.h (xsignal): Now an inline function, as it's now just an alias for Fsignal.
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