The compiler currently rejects iterating on an interface type derived
from an iterator type.
See Ada RM 5.5.1(6/3) and 5.5.2(3/3).
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* sem_ch5.adb (Analyze_Iterator_Specification): Fix Typ in the
case of a class-wide derived iterator.diff --git a/gcc/ada/sem_ch5.adb b/gcc/ada/sem_ch5.adb
--- a/gcc/ada/sem_ch5.adb
+++ b/gcc/ada/sem_ch5.adb
@@ -2761,9 +2761,21 @@ package body Sem_Ch5 is
end;
end if;
- -- IN iterator, domain is a range, or a call to Iterate function
+ -- IN iterator, domain is a range, a call to Iterate function,
+ -- or an object/actual parameter of an iterator type.
else
+ -- If the type of the name is class-wide and its root type is a
+ -- derived type, the primitive operations (First, Next, etc.) are
+ -- those inherited by its specific type. Calls to these primitives
+ -- will be dispatching.
+
+ if Is_Class_Wide_Type (Typ)
+ and then Is_Derived_Type (Etype (Typ))
+ then
+ Typ := Etype (Typ);
+ end if;
+
-- For an iteration of the form IN, the name must denote an
-- iterator, typically the result of a call to Iterate. Give a
-- useful error message when the name is a container by itself.
