[Bug c++/102529] ctad for aliases fails in the presence of constraints

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102529

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Hmm, it looks like this issue isn't concepts specific.  Any non-trivial alias
template, i.e. one that isn't just a renaming of the underlying template (in
the sense of cwg1286) exhibits this bug.  We still reject the testcase if
define the alias template A as, say,

  template <typename T>
  using A = C<const T>;