https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66067
--- Comment #5 from James Almer <jamrial at gmail dot com> --- Created attachment 35683 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35683&action=edit Preprocessed source as generated by -freport-bug, third test case, gcc 5.1.1 svn 223417 How about this one? Crashes with segmentation fault on gcc 5.1.1 svn 223417 (ArchLinux x86_64). With gcc 6.0.0 svn 223906 it crashes with apparently the same tree_check ICE as the first test case. I can post that -freport-bug output if needed.