text: // Copyright 2017 The Emscripten Authors.  All rights reserved.
  // Emscripten is available under two separate licenses, the MIT license and the
  // University of Illinois/NCSA Open Source License.  Both these licenses can be
  // found in the LICENSE file.
  
  #include <stdio.h>
  #include <math.h>
  
  // We have to use a proxy function 'acos_test' here because the updated libc++ library provides a set of overloads to acos,
  // this has the result that we can't take the function pointer to acos anymore due to failed overload resolution.
  // This proxy function has no overloads so it's allowed to take the function pointer directly.
  double acos_test(double x) {
    return acos(x);
  }
  
  typedef double (*ddd)(double x, double unused);
  typedef int    (*iii)(int x,    int unused);
  
  int main() {
    volatile ddd d = (ddd)acos_test;
    volatile iii i = (iii)acos_test;
    printf("|%.3f,%d|\n", d(0.3, 0.6), i(0, 0));
    return 0;
  }
  