https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114488
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
On the gcc-9 branch the first bad commit is r9-8623-g0296697cf9893d
commit 0296697cf9893dc9509cdcd8e3fd4ba9fe422527
Author: Jason Merrill
Date: Mon May 25 18:38:09 2020 -0400
c++: constexpr and lambda capture [PR90212]
This is the same issue as PR86429, just in potential_constant_expression_1
rather than cxx_eval_constant_expression. As in that case, when we're
trying to evaluate a constant expression within a lambda, we don't have a
constant closure object to refer to, but we can try to refer directly to
the
captured variable.
PR c++/90212
* constexpr.c (potential_constant_expression_1): In a lambda
function, consider a captured variable directly.
