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From: "pacoarjonilla at yahoo dot es" <gcc-bugzilla@gcc.gnu.org>
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Subject: =?UTF-8?B?W0J1ZyBjKysvMTA4NzE3XSBOZXc6IHBhc3RpbmcgIiIiXyIgYW5k?=
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Date: Wed, 08 Feb 2023 12:54:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108717

            Bug ID: 108717
           Summary: pasting """_" and "=C2=B5m" does not give a valid
                    preprocessing token in user-defined literal operator
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pacoarjonilla at yahoo dot es
  Target Milestone: ---

The following code is accepted by clang and MSVC, but not GCC:

$ g++-13 --std=3Dc++2b
'''
int operator""_=C2=B5m(long double magnitude) noexcept // Micro sign, unico=
de 0x00b5
{
    return magnitude;
}
'''
But character '=C2=B5' is unicode XID_Start, so it should be accepted.

Compiler output:

<source>:1:16: error: expected initializer before '\U000000b5m'
    1 | int operator""_=C2=B5m(long double magnitude) noexcept \
      |                ^~
Compiler returned: 1=