[llvm-bugs] [Bug 42600] New: [7 Regression] Lambda call in template parameter causes compile time error

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42600

            Bug ID: 42600
           Summary: [7 Regression] Lambda call in template parameter
                    causes compile time error
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: antoshkka 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

Following example compiles in Clang-6 and GCC with flags "-O2 -std=c++17", but
fail to compile in Clang-7, Clang-8 and trunk:

template <int I> struct stuff {};
stuff< [](){ return 42; }() > a; // Calling a constexpr lambda


Error message: lambda expression cannot appear in this context

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