https://inbox.sourceware.org/gcc-patches/873752tce1.fsf@linux-m68k.org/T/
Fix -Wreturn-type fallout
fixtypefallout
https://bugzilla.mozilla.org/show_bug.cgi?id=1476477
1476477 - Change some nsAutoCString to nsCString to fix -Wreturn-std-move in windows widget
RESOLVED (xidorn+moz) in Core - Widget: Win32. Last updated 2018-07-18.