ada: Tune detection of expression functions within a declare expression

Code cleanup; semantics is unaffected.

gcc/ada/

	* sem_ch4.adb (Check_Action_OK): Replace low-level test with a
	high-level routine.
	* sem_ch13.adb (Is_Predicate_Static): Likewise.

2 files changed, 3 insertions, 3 deletions

diff --git a/gcc/ada/sem_ch13.adb b/gcc/ada/sem_ch13.adb
index b13af26..958b26e 100644
--- a/gcc/ada/sem_ch13.adb
+++ b/gcc/ada/sem_ch13.adb
@@ -14261,7 +14261,7 @@ package body Sem_Ch13 is
       --   transformed into just "(S /= 0)", which would appear to be
       --   a predicate-static expression (and therefore legal).
 
-      if Original_Node (Expr) /= Expr then
+      if Is_Rewrite_Substitution (Expr) then
 
          --  Emit warnings for predicates that are always True or always False
          --  and were not originally expressed as Boolean literals.
diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index a85c988..c8bb99b 100644
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -2371,11 +2371,11 @@ package body Sem_Ch4 is
          if not Comes_From_Source (N) or else not Comes_From_Source (A) then
 
             --  If, for example, an (illegal) expression function is
-            --  transformed into a"vanilla" function then we don't want to
+            --  transformed into a "vanilla" function then we don't want to
             --  allow it just because Comes_From_Source is now False. So look
             --  at the Original_Node.
 
-            if A /= Original_Node (A) then
+            if Is_Rewrite_Substitution (A) then
                Check_Action_OK (Original_Node (A));
             end if;