https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109647
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- This is a clang bug. The primary template on line 5850 has these constraints: template<view _Vp> requires input_range<_Vp> class chunk_view : public view_interface<chunk_view<_Vp>> But then there is a partial specialization for forward_range on line 6075: template<view _Vp> requires forward_range<_Vp> class chunk_view<_Vp> : public view_interface<chunk_view<_Vp>> The error on line 6151 incorrectly says that the definition is inconstistent with line 5850. That's true, but it's a definition for the one on line 6075 instead.