Check for illegal reference in function.

gcc/fortran/ChangeLog

@@ -1,3 +1,10 @@
+2020-01-19  Thomas König  <tkoenig@gcc.gnu.org>
+
+	PR fortran/44960
+	* primary.c (gfc_match_rvalue): Break after setting MATCH_ERROR.
+	* resolve.c (resolve_function): Issue error when a
+	function call contains a reference.
+
 2020-01-17  Mark Eggleston  <mark.eggleston@codethink.com>
 
 	PR fortran/93236

gcc/fortran/primary.c

@@ -3661,6 +3661,7 @@ gfc_match_rvalue (gfc_expr **result)
 	  gfc_error ("The leftmost part-ref in a data-ref cannot be a "
 		     "function reference at %C");
 	  m = MATCH_ERROR;
+	  break;
 	}
 
       m = MATCH_YES;

gcc/fortran/resolve.c

@@ -3129,6 +3129,13 @@ resolve_function (gfc_expr *expr)
 	  || sym->intmod_sym_id == GFC_ISYM_CAF_SEND))
     return true;
 
+  if (expr->ref)
+    {
+      gfc_error ("Unexpected junk after %qs at %L", expr->symtree->n.sym->name,
+		 &expr->where);
+      return false;
+    }
+
   if (sym && sym->attr.intrinsic
       && !gfc_resolve_intrinsic (sym, &expr->where))
     return false;

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2020-01-19  Thomas König  <tkoenig@gcc.gnu.org>
+
+	PR fortran/44960
+	* gfortran.dg/function_reference_1.f90: New test.
+	* gfortran.dg/function_reference_2.f90: New test.
+
 2020-01-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/92833

gcc/testsuite/gfortran.dg/function_reference_1.f90

@@ -0,0 +1,11 @@
+! { dg-do compile }
+! PR 44960 - this was erroneusly accepted.
+! Original test case by Daniel Franke.
+
+type t
+  integer :: a
+end type t
+type(t) :: foo
+print *, foo(1)%a ! { dg-error "Unexpected junk" }
+end
+

gcc/testsuite/gfortran.dg/function_reference_2.f90

@@ -0,0 +1,10 @@
+! { dg-do compile }
+! PR 44960 - improve the error message
+program main
+  type t
+  integer :: a
+end type t
+type(t) :: foo
+external foo
+i = foo(1)%1 ! { dg-error "leftmost part-ref in a data-ref cannot be a function reference" }
+end