[llvm-bugs] [Bug 40978] New: Clang should raise a compile-error when co_await used in a catch-block

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40978

            Bug ID: 40978
           Summary: Clang should raise a compile-error when co_await used
                    in a catch-block
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: lewissbaker 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

The Coroutines TS N4775 [expr.await] paragraph 2 states:
> An await-expression shall appear only in a potentially-evaluated expression
> within the compound-statement of a function-body outside of a handler (Clause 18).

However, current trunk version of clang does not emit a
compile-error/diagnostic when a co_await expression is used within a handler.

https://godbolt.org/z/24MgJZ

Clang should be detecting use of co_await within a catch block and raising a
compile-error that indicates this is not allowed.

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