[llvm-bugs] [Bug 47357] New: clang falls on a valid code with an error: 'no matching constructor for initialization'

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47357

            Bug ID: 47357
           Summary: clang falls on a valid code with an error: 'no
                    matching constructor for initialization'
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tangyixuan at mail.dlut.edu.cn
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Clang++ rejects the following code, while g++ accepts.

$ cat s.cpp
struct A
{
  int a;
};

void f()
{
  auto y = new A(1);
}

$ clang -v 
clang version 11.0.0 (https://github.com/llvm/llvm-project.git
ab4627364aefcaac751e757b721b7d07b48a545a)
Target: x86_64-unknown-linux-gnu
Thread model: posix

$ g++ -c -std=c++2a s.cpp
success.

$ clang++ -c std=c++2a s.cpp
s.cpp:8:16: error: no matching constructor for initialization of 'A'
  auto y = new A(1);
               ^ ~
s.cpp:1:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 'A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit default constructor) not
viable: requires 0 arguments, but 1 was provided
1 error generated.

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