[LLVMbugs] [Bug 23824] New: clang allows invalid lambda expression in decltype

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23824

            Bug ID: 23824
           Summary: clang allows invalid lambda expression in decltype
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ryan.burn at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following invalid code compiles with clang (-std=c++14).

#include <type_traits>

template<class T>
constexpr int f() {
  using Func = decltype(
    [](auto x) { return x; }
  );
  return 0;
}

int main() {
  std::integral_constant<int, f<int>()> x;
  return 0;
}

Both gcc and EDG reject it.

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