r179750 61.9 MB 2015-02-06 23:25:00 GMT crashes on launch
Could you please attach a crash log?
Dyld Error Message:
Symbol not found: __ZN3WTF18fastMallocGoodSizeEm
Referenced from: /System/Library/PrivateFrameworks/Safari.framework/Versions/A/Safari
Turns out that the offending change has been already undone, so the next nightly build should work. Sorry for the trouble!
*** This bug has been marked as a duplicate of bug 141335 ***