https://bugs.llvm.org/show_bug.cgi?id=35200

            Bug ID: 35200
           Summary: Regression: new -Wsign-conversion warning after
                    r316268
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedb...@nondot.org
          Reporter: efrie...@codeaurora.org
                CC: aa...@aaronballman.com, lebedev...@gmail.com,
                    llvm-bugs@lists.llvm.org

Testcase:

enum X { A,B,C};
int f(enum X x) { return x; }

<stdin>:2:26: warning: implicit conversion changes signedness: 'enum X' to
'int' [-Wsign-conversion]
int f(enum X x) { return x; }
                  ~~~~~~ ^
1 warning generated.

Technically, the warning is correct, but I'm not sure it's useful.  And at the
very least, we should have some regression test coverage for this sort of
thing.

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