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From: "xmh970252187 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102514] The allocation function shall not be called when
 existing an erroneous expression in noptr-new-declarator
Date: Mon, 25 Oct 2021 01:10:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102514

--- Comment #2 from jim x <xmh970252187 at gmail dot com> ---
It seems that they all do not obey [expr.new] p9, which says that

If the expression in a noptr-new-declarator is present, it is implicitly
converted to std=E2=80=8B::=E2=80=8Bsize_=C2=ADt. The expression is erroneo=
us if:

- the expression is of non-class type and its value before converting to
std=E2=80=8B::=E2=80=8Bsize_=C2=ADt is less than zero;

- [...]

If the expression is erroneous after converting to std=E2=80=8B::=E2=80=8Bs=
ize_=C2=ADt:=20

- if the expression is a core constant expression, the program is ill-forme=
d;=20

- otherwise, an allocation function is not called; instead

  - if the allocation function that would have been called has a non-throwi=
ng=20
    exception specification ([except.spec]), the value of the new-expressio=
n is=20
    the null pointer value of the required result type;=20=20

  - otherwise, the new-expression terminates by throwing an exception of a =
type=20
    that would match a handler ([except.handle]) of type
std=E2=80=8B::=E2=80=8Bbad_=C2=ADarray_=C2=ADnew_=C2=AD=20
    length.=