[COMMITTED] ada: Add guard for detection of class-wide precondition subprograms

[COMMITTED] ada: Add guard for detection of class-wide precondition subprograms

[Marc Poulhiès]

From: Piotr Trojanek <trojanek@adacore.com>

When skipping check on subprograms built for class-wide preconditions
we must deal with the current scope not being a subprogram, e.g. it
could be a declare-block.

gcc/ada/

	* sem_res.adb (Resolve_Actuals): Add guard for the call to
	Class_Preconditions_Subprogram.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_res.adb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index 2c8efec524b..d3a0192fb09 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -5146,7 +5146,10 @@ package body Sem_Res is
             if Is_EVF_Expression (A)
               and then Extensions_Visible_Status (Nam) =
                        Extensions_Visible_True
-              and then No (Class_Preconditions_Subprogram (Current_Scope))
+              and then not
+               (Is_Subprogram (Current_Scope)
+                  and then
+                Present (Class_Preconditions_Subprogram (Current_Scope)))
             then
                Error_Msg_N
                  ("formal parameter cannot act as actual parameter when "
-- 
2.40.0