[Ada] Fix missing insertion of explicit dereference in instance

2020-06-11  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* sem_res.adb (Resolve_Implicit_Dereference): In an instance,
	reset the type of the prefix if it is private before building
	the dereference.

diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index 71c9ed2b0f0383b1b0a0b220a7df5f8fc552add3..5fa74f0f48b2a392870bc0564c971fa250d1b389 100644 (file)
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -8740,6 +8740,17 @@ package body Sem_Res is
       Desig_Typ : Entity_Id;
 
    begin
+      --  In an instance the proper view may not always be correct for
+      --  private types, see e.g. Sem_Type.Covers for similar handling.
+
+      if Is_Private_Type (Etype (P))
+        and then Present (Full_View (Etype (P)))
+        and then Is_Access_Type (Full_View (Etype (P)))
+        and then In_Instance
+      then
+         Set_Etype (P, Full_View (Etype (P)));
+      end if;
+
       if Is_Access_Type (Etype (P)) then
          Desig_Typ := Implicitly_Designated_Type (Etype (P));
          Insert_Explicit_Dereference (P);