https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118719
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- More generally, [X/Y/Z Regression] means a regression present in the X.x, Y.x and Z.x release series. The 'Known to work' and 'Known to fail' fields can be used to provide more specific information about which versions worked before the regression.
