--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/gomp/reduction-task-2.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,40 @@
+int v;
+extern void foo (int);
+
+void
+bar (void)
+{
+  int i;
+  #pragma omp for reduction (task, +: v) nowait	/* { dg-error "'task' reduction modifier on a construct with a 'nowait' clause" } */
+  for (i = 0; i < 64; i++)
+    foo (i);
+  #pragma omp sections nowait reduction (task, +: v)	/* { dg-error "'task' reduction modifier on a construct with a 'nowait' clause" } */
+  {
+    foo (-2);
+    #pragma omp section
+    foo (-3);
+  }
+  #pragma omp simd reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct other than 'parallel', 'for' or 'sections'" } */
+  for (i = 0; i < 64; i++)
+    v++;
+  #pragma omp for simd reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct combined with 'simd'" } */
+  for (i = 0; i < 64; i++)
+    v++;
+  #pragma omp parallel for simd reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct combined with 'simd'" } */
+  for (i = 0; i < 64; i++)
+    v++;
+  #pragma omp teams distribute parallel for simd reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct combined with 'simd'" } */
+  for (i = 0; i < 64; i++)
+    v++;
+  #pragma omp taskloop reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct other than 'parallel', 'for' or 'sections'" } */
+  for (i = 0; i < 64; i++)
+    foo (i);
+  #pragma omp taskloop simd reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct combined with 'simd'" } */
+  for (i = 0; i < 64; i++)
+    v++;
+  #pragma omp teams reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct other than 'parallel', 'for' or 'sections'" } */
+  foo (i);
+  #pragma omp teams distribute reduction (task, +: v)	/* { dg-error "invalid 'task' reduction modifier on construct not combined with 'parallel', 'for' or 'sections'" } */
+  for (i = 0; i < 64; i++)
+    foo (i);
+}