[Ada] Unnesting: improve handling of bounds for formal parameters

2018-06-11  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* exp_unst.adb (Visit_Node): Check reference to formal parameter of
	current procedure, because the bounds of its type may be uplevel
	references.

From-SVN: r261394

gcc/ada/ChangeLog

+2018-06-11  Ed Schonberg  <schonberg@adacore.com>
+
+	* exp_unst.adb (Visit_Node): Check reference to formal parameter of
+	current procedure, because the bounds of its type may be uplevel
+	references.
+
 2018-06-02  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Constant>: If this is

gcc/ada/exp_unst.adb

@@ -999,6 +999,20 @@ package body Exp_Unst is
                           and then not Is_Static_Type (Ent)
                         then
                            Note_Uplevel_Ref (Ent, N, Caller, Callee);
+
+                        --  Check the type of a formal parameter of the current
+                        --  subprogram, whose formal type may be an uplevel
+                        --  reference.
+
+                        elsif Is_Formal (Ent)
+                          and then Scope (Ent) = Current_Subprogram
+                        then
+                           declare
+                              DT : Boolean := False;
+
+                           begin
+                              Check_Static_Type (Etype (Ent), Empty, DT);
+                           end;
                         end if;
                      end if;
                   end if;