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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100252] [9/10/11/12 Regression] Internal compiler error
 during template instantiation
Date: Tue, 26 Apr 2022 15:58:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100252

--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Proof of concept:

--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -3296,6 +3296,14 @@ finish_compound_literal (tree type, tree
compound_literal,
       if (TREE_CODE (compound_literal) =3D=3D CONSTRUCTOR)
        TREE_HAS_CONSTRUCTOR (compound_literal) =3D false;
       compound_literal =3D get_target_expr_sfinae (compound_literal, compl=
ain);
+      if (parsing_nsdmi ())
+       {
+         tree obj =3D TARGET_EXPR_SLOT (compound_literal);
+         tree &ctor =3D TARGET_EXPR_INITIAL (compound_literal);
+         replace_placeholders (compound_literal, obj);
+         if (TREE_CODE (ctor) =3D=3D CONSTRUCTOR)
+           CONSTRUCTOR_PLACEHOLDER_BOUNDARY (ctor) =3D false;
+       }
     }
   else
     /* For e.g. int{42} just make sure it's a prvalue.  */=