Index: fortran/check.c
===================================================================
--- fortran/check.c	(revision 180529)
+++ fortran/check.c	(working copy)
@@ -934,7 +934,7 @@ null_arg:
 gfc_try
 gfc_check_atan_2 (gfc_expr *y, gfc_expr *x)
 {
-  /* gfc_notify_std would be a wast of time as the return value
+  /* gfc_notify_std would be a waste of time as the return value
      is seemingly used only for the generic resolution.  The error
      will be: Too many arguments.  */
   if ((gfc_option.allow_std & GFC_STD_F2008) == 0)
@@ -2710,6 +2710,16 @@ gfc_check_nearest (gfc_expr *x, gfc_expr
   if (type_check (s, 1, BT_REAL) == FAILURE)
     return FAILURE;
 
+  if (s->expr_type == EXPR_CONSTANT)
+    {
+      if (mpfr_sgn (s->value.real) == 0)
+	{
+	  gfc_error ("Argument 'S' of NEAREST at %L shall not be zero",
+		     &s->where);
+	  return FAILURE;
+	}
+    }
+
   return SUCCESS;
 }
 
Index: fortran/simplify.c
===================================================================
--- fortran/simplify.c	(revision 180529)
+++ fortran/simplify.c	(working copy)
@@ -1899,13 +1899,7 @@ simplify_dshift (gfc_expr *arg1, gfc_exp
   k = gfc_validate_kind (BT_INTEGER, arg1->ts.kind, false);
   size = gfc_integer_kinds[k].bit_size;
 
-  if (gfc_extract_int (shiftarg, &shift) != NULL)
-    {
-      gfc_error ("Invalid SHIFT argument of DSHIFTL at %L", &shiftarg->where);
-      return &gfc_bad_expr;
-    }
-
-  gcc_assert (shift >= 0 && shift <= size);
+  gfc_extract_int (shiftarg, &shift);
 
   /* DSHIFTR(I,J,SHIFT) = DSHIFTL(I,J,SIZE-SHIFT).  */
   if (right)
@@ -2509,21 +2503,10 @@ gfc_simplify_ibclr (gfc_expr *x, gfc_exp
   if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (gfc_extract_int (y, &pos) != NULL || pos < 0)
-    {
-      gfc_error ("Invalid second argument of IBCLR at %L", &y->where);
-      return &gfc_bad_expr;
-    }
+  gfc_extract_int (y, &pos);
 
   k = gfc_validate_kind (x->ts.type, x->ts.kind, false);
 
-  if (pos >= gfc_integer_kinds[k].bit_size)
-    {
-      gfc_error ("Second argument of IBCLR exceeds bit size at %L",
-		 &y->where);
-      return &gfc_bad_expr;
-    }
-
   result = gfc_copy_expr (x);
 
   convert_mpz_to_unsigned (result->value.integer,
@@ -2551,17 +2534,8 @@ gfc_simplify_ibits (gfc_expr *x, gfc_exp
       || z->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (gfc_extract_int (y, &pos) != NULL || pos < 0)
-    {
-      gfc_error ("Invalid second argument of IBITS at %L", &y->where);
-      return &gfc_bad_expr;
-    }
-
-  if (gfc_extract_int (z, &len) != NULL || len < 0)
-    {
-      gfc_error ("Invalid third argument of IBITS at %L", &z->where);
-      return &gfc_bad_expr;
-    }
+  gfc_extract_int (y, &pos);
+  gfc_extract_int (z, &len);
 
   k = gfc_validate_kind (BT_INTEGER, x->ts.kind, false);
 
@@ -2614,21 +2588,10 @@ gfc_simplify_ibset (gfc_expr *x, gfc_exp
   if (x->expr_type != EXPR_CONSTANT || y->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (gfc_extract_int (y, &pos) != NULL || pos < 0)
-    {
-      gfc_error ("Invalid second argument of IBSET at %L", &y->where);
-      return &gfc_bad_expr;
-    }
+  gfc_extract_int (y, &pos);
 
   k = gfc_validate_kind (x->ts.type, x->ts.kind, false);
 
-  if (pos >= gfc_integer_kinds[k].bit_size)
-    {
-      gfc_error ("Second argument of IBSET exceeds bit size at %L",
-		 &y->where);
-      return &gfc_bad_expr;
-    }
-
   result = gfc_copy_expr (x);
 
   convert_mpz_to_unsigned (result->value.integer,
@@ -3004,11 +2967,8 @@ simplify_shift (gfc_expr *e, gfc_expr *s
 
   if (e->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
     return NULL;
-  if (gfc_extract_int (s, &shift) != NULL)
-    {
-      gfc_error ("Invalid second argument of %s at %L", name, &s->where);
-      return &gfc_bad_expr;
-    }
+
+  gfc_extract_int (s, &shift);
 
   k = gfc_validate_kind (BT_INTEGER, e->ts.kind, false);
   bitsize = gfc_integer_kinds[k].bit_size;
@@ -3146,11 +3106,7 @@ gfc_simplify_ishftc (gfc_expr *e, gfc_ex
   if (e->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (gfc_extract_int (s, &shift) != NULL)
-    {
-      gfc_error ("Invalid second argument of ISHFTC at %L", &s->where);
-      return &gfc_bad_expr;
-    }
+  gfc_extract_int (s, &shift);
 
   k = gfc_validate_kind (e->ts.type, e->ts.kind, false);
   isize = gfc_integer_kinds[k].bit_size;
@@ -3160,18 +3116,8 @@ gfc_simplify_ishftc (gfc_expr *e, gfc_ex
       if (sz->expr_type != EXPR_CONSTANT)
 	return NULL;
 
-      if (gfc_extract_int (sz, &ssize) != NULL || ssize <= 0)
-	{
-	  gfc_error ("Invalid third argument of ISHFTC at %L", &sz->where);
-	  return &gfc_bad_expr;
-	}
+      gfc_extract_int (sz, &ssize);
 
-      if (ssize > isize)
-	{
-	  gfc_error ("Magnitude of third argument of ISHFTC exceeds "
-		     "BIT_SIZE of first argument at %L", &s->where);
-	  return &gfc_bad_expr;
-	}
     }
   else
     ssize = isize;
@@ -3183,10 +3129,7 @@ gfc_simplify_ishftc (gfc_expr *e, gfc_ex
 
   if (ashift > ssize)
     {
-      if (sz != NULL)
-	gfc_error ("Magnitude of second argument of ISHFTC exceeds "
-		   "third argument at %L", &s->where);
-      else
+      if (sz == NULL)
 	gfc_error ("Magnitude of second argument of ISHFTC exceeds "
 		   "BIT_SIZE of first argument at %L", &s->where);
       return &gfc_bad_expr;
@@ -4382,13 +4325,6 @@ gfc_simplify_nearest (gfc_expr *x, gfc_e
   if (x->expr_type != EXPR_CONSTANT || s->expr_type != EXPR_CONSTANT)
     return NULL;
 
-  if (mpfr_sgn (s->value.real) == 0)
-    {
-      gfc_error ("Second argument of NEAREST at %L shall not be zero",
-		 &s->where);
-      return &gfc_bad_expr;
-    }
-
   result = gfc_copy_expr (x);
 
   /* Save current values of emin and emax.  */
Index: testsuite/gfortran.dg/nearest_5.f90
===================================================================
--- testsuite/gfortran.dg/nearest_5.f90	(revision 0)
+++ testsuite/gfortran.dg/nearest_5.f90	(revision 0)
@@ -0,0 +1,10 @@
+! { dg-do compile }
+program a
+  real x, y(2)
+  x = 1./3.
+  y = [1, 2] / 3.
+  print *, nearest(x, 0.)              ! { dg-error "shall not be zero" }
+  print *, nearest(y, 0.)              ! { dg-error "shall not be zero" }
+  print *, nearest([1., 2.] / 3., 0.)  ! { dg-error "shall not be zero" }
+  print *, nearest(1., 0.)             ! { dg-error "shall not be zero" }
+end program a
