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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/57573] [C++1y] bogus "taking address of temporary" error
Date: Tue, 02 Apr 2024 11:17:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D57573

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D60409
      Known to work|4.10.0                      |5.0

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For the record, it started to fail with:

commit 10c6dc8e3932d33c8e47e6706885d2412b29c069 [r0-122521-g10c6dc8e3932d3]
Author: Jason Merrill
Date:   Fri Mar 29 19:51:36 2013

    cp-tree.h (AUTO_IS_DECLTYPE): New.

            N3582
            * cp-tree.h (AUTO_IS_DECLTYPE): New.
            * parser.c (cp_parser_decltype): Handle decltype(auto).
            (cp_parser_type_id_1): Allow auto without a late-specified
            return in C++1y.
            (cp_parser_primary_expression): Use the return value of
            finish_parenthesized_expr.
            (cp_parser_transaction_expression): Likewise.
            * semantics.c (force_paren_expr): New.
            (finish_parenthesized_expr): Use it.
            * call.c (build_conditional_expr_1): Likewise.
            * pt.c (do_auto_deduction): Handle decltype(auto).
            (tsubst_copy): Handle PAREN_EXPR.
            (tsubst_copy_and_build): Likewise.
            * error.c (dump_expr): Handle PAREN_EXPR.
            * cxx-pretty-print.c (pp_cxx_expression): Likewise.
            * mangle.c (write_expression): Ignore PAREN_EXPR.

            * parser.c (cp_parser_decltype_expr): Split out...
            (cp_parser_decltype): ...from here.

    From-SVN: r197248

That commit also caused an ICE, and then this bug and the ICE were both fix=
ed
by:

commit f9b381b8eb56252e302b88ea4fe89beffc33cf80 [r0-128726-gf9b381b8eb5625]
Author: Jason Merrill
Date:   Wed Mar 5 19:25:37 2014

    re PR c++/60409 ([c++1y] ICE on valid with template function)

            PR c++/60409
            * semantics.c (force_paren_expr): Only add a PAREN_EXPR to a
            dependent expression.

    From-SVN: r208352=