On Tue, May 24, 2022 at 08:36:39AM -0400, Jason Merrill wrote: > On 5/16/22 11:36, Marek Polacek wrote: > > +static tree > > +replace_placeholders_for_class_temp_r (tree *tp, int *, void *data) > > +{ > > + tree t = *tp; > > + tree full_expr = *static_cast<tree *>(data); > > + > > + /* We're looking for a TARGET_EXPR nested in the whole expression. */ > > + if (TREE_CODE (t) == TARGET_EXPR > > + && !potential_prvalue_result_of (t, full_expr)) > > + { > > + tree init = TARGET_EXPR_INITIAL (t); > > + while (TREE_CODE (init) == COMPOUND_EXPR) > > + init = TREE_OPERAND (init, 1); > > Hmm, how do we get a COMPOUND_EXPR around a CONSTRUCTOR?
Sadly, that's possible for code like (from nsdmi-aggr18.C) struct D { int x = 42; B b = (true, A{x}); }; where the TARGET_EXPR_INITIAL is <<< Unknown tree: void_cst >>>, {.x=((struct D *) this)->x, .y=(&<PLACEHOLDER_EXPR struct A>)->x} Marek