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[Ada] Handle IN iterator for class-wide derived object of iterator type

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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).

gcc/ada/

	* sem_ch5.adb (Analyze_Iterator_Specification): Fix Typ in the
	case of a class-wide derived iterator.
This commit is contained in:
Ed Schonberg 2022-02-15 15:38:42 +01:00 committed by Pierre-Marie de Rodat
parent 3fe35ab093
commit 7b6fa643ef
1 changed files with 13 additions and 1 deletions
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14
gcc/ada/sem_ch5.adb
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@ -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.