[Bug c++/117501] [14/15 Regression] Consteval constructor does not initialize the variable

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117501

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think the problem is that we evaluate

    struct QQQ q;
  <<cleanup_point <<< Unknown tree: expr_stmt
    QQQ::QQQ (&q, TARGET_EXPR <D.2687, <<< Unknown tree: aggr_init_expr
      5
      __ct_comp 
      D.2687
      (struct basic_string_view *) <<< Unknown tree: void_cst >>>
      (const char *) "" >>>>) >>>>>;

into

    struct QQQ q;
  <<cleanup_point <<< Unknown tree: expr_stmt
    {.data={._M_len=42, ._M_str=0}} >>>>>;

and then the useless expr_stmt is dropped on the floor.  So q isn't
initialized.