[llvm-bugs] [Bug 27148] New: Clang incorrectly treat capture-by-reference variable in lambda as constexpr

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27148

            Bug ID: 27148
           Summary: Clang incorrectly treat capture-by-reference variable
                    in lambda as constexpr
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ytj000 at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following code shows clang has inconsistent behavior.

struct A {
    constexpr operator int() const { return 0; }
};

int main() {
    A a;
    [&a]() { constexpr int b = a; };  // clang incorrectly accepted

    A &ra = a;
    constexpr int b = ra; // clang rejected
}

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