[llvm-bugs] [Bug 43715] New: Bad diagnostic on compile error in constant evaluation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43715

            Bug ID: 43715
           Summary: Bad diagnostic on compile error in constant evaluation
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: barry.revzin at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

>From stack overflow (https://stackoverflow.com/q/58454657/2069064):

constexpr int f(int n)
{
    int r = n--;
    for (; n > 1; --n) r *= n;
        return r;
}

constexpr int x = f(13);

On clang trunk, with --std=c++17, this fails to compile (as expected), but the
error says (https://gcc.godbolt.org/z/2f15Qi):

<source>:8:15: error: constexpr variable 'x' must be initialized by a constant
expression
constexpr int x = f(13);
              ^   ~~~~~
<source>:4:26: note: value 3113510400 is outside the range of representable
values of type 'int'
    for (; n > 1; --n) r *= n;
                         ^
<source>:8:19: note: in call to 'f(3)'
constexpr int x = f(13);
                  ^

There's no call to f(3) in this program, but the diagnostic erroneously
references it.

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