fixes #1888

tests/exception/tonraise.nim

@@ -4,8 +4,8 @@ success'''
 """
 
 type
-  ESomething = object of E_Base
-  ESomeOtherErr = object of E_Base
+  ESomething = object of Exception
+  ESomeOtherErr = object of Exception
 
 proc genErrors(s: string) =
   if s == "error!":
@@ -17,14 +17,14 @@ proc foo() =
   var i = 0
   try:
     inc i
-    onRaise(proc (e: ref E_Base): bool =
+    onRaise(proc (e: ref Exception): bool =
       echo "i: ", i)
     genErrors("errssor!")
   except ESomething:
     echo("ESomething happened")
   except:
     echo("Some other error happened")
-    
+
   # test that raise handler is gone:
   try:
     genErrors("error!")