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

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify
   2 // RUN: %clang_cc1 %s -fexperimental-new-constant-interpreter -fsyntax-only -verify
   3
   4 template <typename T>
   5 constexpr T foo(T a);   // expected-note {{declared here}}
   6
   7 int main() {
   8   int k = foo<int>(5);  // Ok
   9   constexpr int j =     // expected-error {{constexpr variable 'j' must be initialized by a constant expression}}
  10           foo<int>(5);  // expected-note {{undefined function 'foo<int>' cannot be used in a constant expression}}
  11 }
  12
  13 template <typename T>
  14 constexpr T foo(T a) {
  15   return a;
  16 }