clang/test/SemaCXX/constexpr-late-instantiation.cpp

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify
   2
   3 template <typename T>
   4 constexpr T foo(T a);   // expected-note {{declared here}}
   5
   6 int main() {
   7   int k = foo<int>(5);  // Ok
   8   constexpr int j =     // expected-error {{constexpr variable 'j' must be initialized by a constant expression}}
   9           foo<int>(5);  // expected-note {{undefined function 'foo<int>' cannot be used in a constant expression}}
  10 }
  11
  12 template <typename T>
  13 constexpr T foo(T a) {
  14   return a;
  15 }