1 files changed, 11 insertions, 0 deletions
diff --git a/tests/tacos.c b/tests/tacos.c
index f566de22d..2bbe6ebbb 100644
--- a/tests/tacos.c
+++ b/tests/tacos.c
@@ -32,6 +32,7 @@ static void
 special (void)
 {
   mpfr_t x, y;
+  int inex1, inex2;
   
   mpfr_init2 (x, 32);
   mpfr_init2 (y, 32);
@@ -54,6 +55,16 @@ special (void)
       mpfr_print_binary (y); printf ("\n");
       exit (1);
     }
+  
+  mpfr_set_prec (x, 2);
+  mpfr_set_ui (x, 0, GMP_RNDN);
+  inex1 = mpfr_acos (x, x, GMP_RNDN); /* Pi/2 */
+  inex2 = mpfr_const_pi (x, GMP_RNDN);
+  if (inex1 != inex2)
+    {
+      printf ("Error in mpfr_acos (3) for prec=2\n");  
+      exit (1);
+    }
 
   mpfr_clear (y);
   mpfr_clear (x);