ada: Improve recovery from illegal occurrence of 'Old in if_expression

Fix assertion failure in developer builds which happened when the THEN
expression contains an illegal occurrence of 'Old and the type of the
THEN expression is left as Any_Type, but there is no ELSE expression.

gcc/ada/

	* sem_ch4.adb (Analyze_If_Expression): Add guard for
	if_expression without an ELSE part.

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index b4414a3f7ff9decf580a283721bacd72abfb5757..03364dade9f63c76c126531e415ec4f41198beb8 100644 (file)
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -2645,7 +2645,7 @@ package body Sem_Ch4 is
                  ("\ELSE expression has}!", Else_Expr, Etype (Else_Expr));
             end if;
 
-         else
+         elsif Present (Else_Expr) then
             if Is_Overloaded (Else_Expr) then
                Error_Msg_N
                  ("no interpretation compatible with type of THEN expression",