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From: "xmh970252187 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112423] New: A weird reported diagnosis about
 user-defined-literal
Date: Tue, 07 Nov 2023 13:28:39 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112423

            Bug ID: 112423
           Summary: A weird reported diagnosis about user-defined-literal
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xmh970252187 at gmail dot com
  Target Milestone: ---

#include <iostream>

struct A{
    void foo(){}
};

A operator ""_to(const char* ptr){
    std::cout<< ptr;
    return A{};
}

int main(){
    123_to. foo();
}

The reported diagnosis is=20
> unable to find numeric literal operator 'operator""_to.'

Well, "123_to." is a single preprocessing token(i.e. pp-number), which is t=
hen
converted to a token in translation phase 7([lex.phases] p1.7), however, the
pp-number is neither a valid integer-literal, floating-point-literal, nor a
user-defined-literal. The diagnosis implies "123_to." is parsed as a
user-defined-literal but a viable operator `operator""_to.` cannot be found,
which is wrong and misleading.=