[Bug c++/118986] [15 Regression] internal compiler error: in replace_decl, at cp/constexpr.cc

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118986

--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
In cp_fold_r we have:

TARGET_EXPR <D.2701, <<< Unknown tree: expr_stmt
  D.2701.__p = TARGET_EXPR <D.2684, <<< Unknown tree: aggr_init_expr
    3
    f1
    D.2684 >>>> >>>>

so object=D.2701, and init is the expr_stmt.  We unwrap the
EXPR_STMT/INIT_EXPR/TARGET_EXPR and end up evaluating the f1 call.  f1 returns
c2; the type of D.2701 is struct ._anon_0.

So then we crash in replace_decl on:

2730      gcc_checking_assert (same_type_ignoring_top_level_qualifiers_p
2731                           (TREE_TYPE (decl), TREE_TYPE (replacement)));