Fixed in the _Optional branch in [r16479].
Fix bug #3964.
This also affects function declaration checking when checking declaration vs. definition: const int *f2(void); volatile int *f2(void) {return 0;} Does not give any diagnostic.
Qualifiers on the return type are not ignored in a function declaration
Merges from trunk.
Disable a check on a line in preparation for rework of _Optional warnings.
How to write regression tests?
Fixed in [r16476], also removing some testsuite features that never really caught on.