[llvm-bugs] [Bug 48870] New: Accepts-invalid for requires-clauses on non-templated function

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https://bugs.llvm.org/show_bug.cgi?id=48870

            Bug ID: 48870
           Summary: Accepts-invalid for requires-clauses on non-templated
                    function
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: davveston 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

As per [dcl.decl]/4 in N4861, a requires-clause shall be present only if the
declarator declares a templated function.

However, clang accepts the follow program:

 void f() requires true { }
 int main() { f(); }

and we may moreover note that constraint checking is actually enforced, as the
following program is rejected (for the wrong reasons) due to overload
resolution failure

 void f() requires false { }
 int main() { f(); }  //  // error: no matching function for call to 'f'

whereas the constraints have not been added to the function's signature (which
is correct, as per [defns.signature]):

 void f() requires true { }
 void f() requires false { }
   // ^ error: definition with same mangled name '...' as another definition

---

(It may be that the implementation was base on [dcl.decl]/4 from the earlier
draft of N4810, which had a weaker requirement: allowing requires-clauses on
declarators that were functions).

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