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From: "foom at fuhm dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/88115] Incorrect result from alignof in templates, if also
 using __alignof__.
Date: Tue, 17 Nov 2020 01:23:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88115

--- Comment #7 from James Y Knight <foom at fuhm dot net> ---
I've created an ABI proposal against itanium abi, here:
https://github.com/itanium-cxx-abi/cxx-abi/issues/112

I realized since writing my last comment here that
  <type> ::=3D u <source-name> [<template-args>] # vendor extended type
has been added a few months ago. Therefore, nothing needs to be added to
support extended expressions as <type>.

And, therefore, since 'u' is also free in expression, I've proposed to simp=
ly
add the same 'u' syntax to "expression", rather than using "Y", as per prev=
ious
comment.

That is:
  <expression> ::=3D u <source-name> [<template-args>] # vendor extended
expression=