[llvm-bugs] [Bug 38145] New: Implicit conversion of nullptr to bool

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38145

            Bug ID: 38145
           Summary: Implicit conversion of nullptr to bool
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

DR 1423 has now reached ready status, 

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1423

so this seems like a good reason to consider a compiler change to evaluate
potential code breakages.

bool b1 = nullptr; // Is well-formed today, needs to be ill-formed

I tried clang++ and g++. clang++ accepts the above code, but g++ rejects it:

error：converting to ‘bool’ from ‘std::nullptr_t’ requires direct-initialization
[-fpermissive]
     bool b1 = nullptr; // Is well-formed today, needs to be ill-formed
               ^~~~~~~

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