https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78121
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> --- After reduction. a; static fn1(c) unsigned char c; { if (a) fn2(c); fn1('#'); } fn3() { fn1('�'); } The blotch character in the quotes near the end seems to have ASCII value 267. Dunno why it's not displaying correctly.