[Bug c++/91590] ICE in : canonical types differ for identical types std::enable_if::ViewConcept< >()> and std::enable_if::ViewConcept< >()>

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91590

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|9.0                         |10.0

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
4.9.4 rejects:

  4.9.4 (d3191480f376c780)(03 Aug 2016 05:07): [took: 1.786s] result: FAILED
(1)
canonical.ii:22:74: error: ‘type’ in ‘struct std::enable_if<false>’ does not
name a type
   template <typename Rng, typename std::enable_if<(ViewConcept<Rng>())>::type>