ada: Dispatching call with mutably tagged objects

The compiler rejects performing a dispatching call using the
prefix notation when the prefix of the call is a mutably
tagged class-wide type object.

gcc/ada/ChangeLog:

	* sem_ch4.adb (Try_Object_Operation): Handle mutably tagged
	class-wide type prefix.

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index 89beb2b9a7e019ce006386f010d3e51e36dbbfea..f5b0519103530798513bfee3aa19146c81c4e64a 100644 (file)
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -10907,6 +10907,10 @@ package body Sem_Ch4 is
    --  Start of processing for Try_Object_Operation
 
    begin
+      if Is_Class_Wide_Equivalent_Type (Obj_Type) then
+         Obj_Type := Corresponding_Mutably_Tagged_Type (Obj_Type);
+      end if;
+
       Analyze_Expression (Obj);
 
       --  Analyze the actuals if node is known to be a subprogram call