https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119182
Xi Ruoyao <xry111 at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |xry111 at gcc dot gnu.org --- Comment #5 from Xi Ruoyao <xry111 at gcc dot gnu.org> --- > Standard Reference: C++17 ยง10.1.3: > "A type-name introduced by a using declaration shall be unique in the > declarative region in which it appears." This is an incorrect reference. "using identifier attribute-specifier-seqopt = defining-type-id ;" an alias-declaration, not a using-declaration.