[llvm-bugs] [Bug 43779] New: [clang-cl] diagnoses __expect(<dependent-expression>) at template parse time

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43779

            Bug ID: 43779
           Summary: [clang-cl] diagnoses __expect(<dependent-expression>)
                    at template parse time
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Casey at Carter.net
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Compiling this well-formed program:

    template <class T>
    void f() {
        __try {}
        __except(T{}) {}
    }

    int main() {
        f<int>();
    }

with "clang-cl /EHsc" diagnoses:

    repro.cpp(4,14): error: filter expression type should be an integral value
not 'T'
        __except(T{}) {}
                ^
    1 error generated. 

Presumably the semantic check should be delayed until instantiation when the
expression passed to "__except" is type-dependent.

(Apologies for selecting "C++" for the Component field on this bug - there's no
option for "Microsoft Extensions.")

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