[llvm-bugs] [Bug 52280] New: Incrementation of bool values is erroneously permitted in not-evaluated contexts

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52280

            Bug ID: 52280
           Summary: Incrementation of bool values is erroneously permitted
                    in not-evaluated contexts
           Product: clang
           Version: 12.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2b
          Assignee: unassignedclangbugs at nondot.org
          Reporter: fchelnokov 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

This program is valid:
```
template<class T>
concept is_incrementable = requires(T t) {
    { ++t };
};

int main() {
    static_assert( is_incrementable<int> );
    static_assert( !is_incrementable<bool> );
}
```
but rejected in Clang because it permits the incrementation of bool values in
not-evaluated contexts.

Related discussion: https://stackoverflow.com/q/51011835/7325599

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