https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65396
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |rejects-valid Status|UNCONFIRMED |NEW Last reconfirmed| |2015-03-12 Ever confirmed|0 |1 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Presumably this rule was never implemented for function templates when they started being allowed default template arguments.