/* gcc asinh.c
 * expected output: asinh(i) = 0.0000 +1.5708i
 * output on musl:  asinh(i) = -0.0000 +1.5708i
 */
#include <stdio.h>
#include <complex.h>

int main() {
  double complex arg = I;
  double complex res = casinh(arg);
  printf("asinh(i) = %.4lf %+.4lfi\n", creal(res), cimag(res));
}