[Bug c++/85149] [8 Regression] False branch of if constexpr instantiated in generic lambda

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85149

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Apr  3 17:41:12 2018
New Revision: 259043

URL: https://gcc.gnu.org/viewcvs?rev=259043&root=gcc&view=rev
Log:
        PR c++/85149 - generic lambda and constexpr if.

        * pt.c (build_extra_args, add_extra_args): Split from
        tsubst_pack_expansion.
        (tsubst_expr) [IF_STMT]: Use them.
        * cp-tree.h (IF_STMT_EXTRA_ARGS): New.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1z/constexpr-if17.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/pt.c