From 3ad67df218bf6073f4c783df54cdf0e20fa5e42a Mon Sep 17 00:00:00 2001
From: Javier Miranda <miranda@adacore.com>
Date: Thu, 27 Jul 2023 11:02:20 +0000
Subject: [PATCH] ada: Spurious error on class-wide preconditions
The compiler reports an spurious error when a class-wide precondition
expression has a class-wide type conversion.
gcc/ada/
* sem_res.adb (Resolve_Type_Conversion): Do not warn on conversion
to class-wide type on internally build helpers of class-wide
preconditions.
---
gcc/ada/sem_res.adb | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index d3a0192fb099..ac0c60f5f22d 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -12455,6 +12455,18 @@ package body Sem_Res is
elsif Orig_T = Base_Type (Standard_Long_Long_Integer) then
null;
+ -- Do not warn on conversion to class-wide type on helpers of
+ -- class-wide preconditions because in this context the warning
+ -- would be spurious (since the class-wide precondition has been
+ -- installed in the return statement of the helper, which has a
+ -- class-wide formal type instead of a regular tagged type).
+
+ elsif Is_Class_Wide_Type (Orig_T)
+ and then Is_Subprogram_Or_Generic_Subprogram (Current_Scope)
+ and then Present (Class_Preconditions_Subprogram (Current_Scope))
+ then
+ null;
+
-- Here we give the redundant conversion warning. If it is an
-- entity, give the name of the entity in the message. If not,
-- just mention the expression.
--
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