Index: gcc/fortran/decl.c
===================================================================
--- gcc/fortran/decl.c	(revision 275390)
+++ gcc/fortran/decl.c	(working copy)
@@ -4023,7 +4023,6 @@ gfc_match_decl_type_spec (gfc_typespec *ts, int implic
       return MATCH_YES;
     }
 
-
   m = gfc_match (" type (");
   matched_type = (m == MATCH_YES);
   if (matched_type)
@@ -4071,7 +4070,10 @@ gfc_match_decl_type_spec (gfc_typespec *ts, int implic
 	m = MATCH_YES;
 
       if (matched_type && m == MATCH_YES && gfc_match_char (')') != MATCH_YES)
-	m = MATCH_ERROR;
+	{
+	  gfc_error ("Malformed type-spec at %C");
+	  return MATCH_ERROR;
+	}
 
       return m;
     }
@@ -4094,8 +4096,12 @@ gfc_match_decl_type_spec (gfc_typespec *ts, int implic
 	  && !gfc_notify_std (GFC_STD_F2008, "TYPE with "
 			      "intrinsic-type-spec at %C"))
 	return MATCH_ERROR;
+
       if (matched_type && gfc_match_char (')') != MATCH_YES)
-	return MATCH_ERROR;
+	{
+	  gfc_error ("Malformed type-spec at %C");
+	  return MATCH_ERROR;
+	}
 
       ts->type = BT_REAL;
       ts->kind = gfc_default_double_kind;
@@ -4125,7 +4131,10 @@ gfc_match_decl_type_spec (gfc_typespec *ts, int implic
 	return MATCH_ERROR;
 
       if (matched_type && gfc_match_char (')') != MATCH_YES)
-	return MATCH_ERROR;
+	{
+	  gfc_error ("Malformed type-spec at %C");
+	  return MATCH_ERROR;
+	}
 
       ts->type = BT_COMPLEX;
       ts->kind = gfc_default_double_kind;
@@ -4146,7 +4155,13 @@ gfc_match_decl_type_spec (gfc_typespec *ts, int implic
       if (m == MATCH_ERROR)
 	return m;
 
-    m = gfc_match_char (')');
+      gfc_gobble_whitespace ();
+      if (gfc_peek_ascii_char () != ')')
+	{
+	  gfc_error ("Malformed type-spec at %C");
+	  return MATCH_ERROR;
+	}
+      m = gfc_match_char (')'); /* Burn closing ')'.  */
     }
 
   if (m != MATCH_YES)
Index: gcc/testsuite/gfortran.dg/pdt_4.f03
===================================================================
--- gcc/testsuite/gfortran.dg/pdt_4.f03	(revision 275390)
+++ gcc/testsuite/gfortran.dg/pdt_4.f03	(working copy)
@@ -97,9 +97,9 @@ contains
     type (mytype(4, *)) :: arg      ! OK
   end subroutine
   subroutine bar(arg)               ! { dg-error "is neither allocatable nor a pointer" }
-    type (thytype(8, :, 4) :: arg
+    type (thytype(8, :, 4)) :: arg
   end subroutine
   subroutine foobar(arg)            ! OK
-    type (thytype(8, *, 4) :: arg
+    type (thytype(8, *, 4)) :: arg
   end subroutine
 end
Index: gcc/testsuite/gfortran.dg/pr91660_1.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr91660_1.f90	(nonexistent)
+++ gcc/testsuite/gfortran.dg/pr91660_1.f90	(working copy)
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! PR fortran/91660
+! Code contributed by Gerhard Steinmetz
+program p
+   type t
+   end type
+   type (t x    ! { dg-error "Malformed type-spec" }
+   x = t()      ! { dg-error "Cannot convert" }
+end
Index: gcc/testsuite/gfortran.dg/pr91660_2.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr91660_2.f90	(nonexistent)
+++ gcc/testsuite/gfortran.dg/pr91660_2.f90	(working copy)
@@ -0,0 +1,9 @@
+! { dg-do compile }
+! PR fortran/91660
+program foo
+   type(doubleprecision :: x   ! { dg-error "Malformed type-spec" }
+   type(double precision :: y  ! { dg-error "Malformed type-spec" }
+   type(character(len=3) :: a  ! { dg-error "Malformed type-spec" }
+   type(doublecomplex :: b     ! { dg-error "Malformed type-spec" }
+   type(double complex :: c    ! { dg-error "Malformed type-spec" }
+end program foo