[Fortran] Fix result-variable handling of MODULE PROCEDURE (PR94348)

	PR fortran/94348
	* decl.c (gfc_match_submod_proc): Add result var to the
	proc's namespace.

	PR fortran/94348
	* gfortran.dg/module_procedure_3.f90: New.

gcc/fortran/ChangeLog

+2020-03-28  Tobias Burnus  <tobias@codesourcery.com>
+
+	PR fortran/94348
+	* decl.c (gfc_match_submod_proc): Add result var to the
+	proc's namespace.
+
 2020-03-27  Tobias Burnus  <tobias@codesourcery.com>
 
 	PR fortran/93957

gcc/fortran/decl.c

@@ -9699,13 +9699,20 @@ gfc_match_submod_proc (void)
   if (get_proc_name (name, &sym, false))
     return MATCH_ERROR;
 
-  /* Make sure that the result field is appropriately filled, even though
-     the result symbol will be replaced later on.  */
+  /* Make sure that the result field is appropriately filled.  */
   if (sym->tlink && sym->tlink->attr.function)
     {
-      if (sym->tlink->result
-	  && sym->tlink->result != sym->tlink)
-	sym->result= sym->tlink->result;
+      if (sym->tlink->result && sym->tlink->result != sym->tlink)
+	{
+	  sym->result = sym->tlink->result;
+	  if (!sym->result->attr.use_assoc)
+	    {
+	      gfc_symtree *st = gfc_new_symtree (&gfc_current_ns->sym_root,
+						 sym->result->name);
+	      st->n.sym = sym->result;
+	      sym->result->refs++;
+	    }
+	}
       else
 	sym->result = sym;
     }

gcc/testsuite/ChangeLog

+2020-03-28  Tobias Burnus  <tobias@codesourcery.com>
+
+	PR fortran/94348
+	* gfortran.dg/module_procedure_3.f90: New.
+
 2020-03-28  Patrick Palka  <ppalka@redhat.com>
 
 	PR c++/94306

gcc/testsuite/gfortran.dg/module_procedure_3.f90

+! { dg-do run }
+!
+! PR fortran/94348
+!
+! Contributed by Damian Rouson
+
+module foo_module
+  implicit none
+
+  interface
+     module function foo() result(bar)
+       implicit none
+       integer bar
+     end function
+  end interface
+
+contains
+  module procedure foo
+    bar = 5
+  end procedure
+end module
+
+program main
+  use foo_module
+  implicit none
+  if (foo() /= 5) stop 1
+end program main