https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105256
--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So, wonder if for a CONSTRUCTOR containing elements which are CONSTRUCTORs with CONSTRUCTOR_PLACEHOLDER_BOUNDARY set we shouldn't move the CONSTRUCTOR_PLACEHOLDER_BOUNDARY flag to the outer CONSTRUCTOR (if not set there already). The reason why the flag was introduced was to catch e.g. those X x { 1, bar (X{2}).n }; etc. cases where the X{2} contains an unrelated PLACEHOLDER_EXPR to the outer one. But when we have directly nested CONSTRUCTORs, we can replace_placeholders all of those PLACEHOLDER_EXPRs from in there, the object will be simply some member of the var or TARGET_EXPR slot etc.