[llvm-bugs] [Bug 47376] New: rejects-valid on non-trailing requires clause in generic lambda

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https://bugs.llvm.org/show_bug.cgi?id=47376

            Bug ID: 47376
           Summary: rejects-valid on non-trailing requires clause in
                    generic lambda
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Per https://wg21.link/p0857r0 (which we claim to implement), a requires-clause
can appear after the explicit template parameter list in a generic lambda, but
Clang rejects:

<source>:1:25: error: lambda requires '()' before 'requires' clause
auto x = []<typename T> requires true () {};
                        ^
                        ()

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