diff -r a4fe023bec06 -r 54f989be66a1 BZip2Stream.st
--- a/BZip2Stream.st	Sun Aug 28 12:43:10 2016 +0200
+++ b/BZip2Stream.st	Tue Aug 30 09:49:35 2016 +0200
@@ -227,8 +227,8 @@
 	errorNo = __MKSMALLINT( _errorNo );
     }
 %}.
-    errorNo ifNil:[
-	zstream ifNil:[self errorNotOpen].
+    errorNo isNil ifTrue:[
+	zstream isNil ifTrue:[self errorNotOpen].
 	self invalidArgument.
     ].
     self zerror:errorNo.
@@ -261,8 +261,8 @@
 	errorNo = __MKSMALLINT( _errorNo );
     }
 %}.
-    errorNo ifNil:[
-	zstream ifNil:[ self errorNotOpen ].
+    errorNo isNil ifTrue:[
+	zstream isNil ifTrue:[ self errorNotOpen ].
 	self invalidArgument.
     ].
     self zerror:errorNo.
@@ -331,7 +331,7 @@
 	errorNo = __MKSMALLINT( _errorNo );
     }
 %}.
-    errorNo ifNil:[ self errorNotOpen ].
+    errorNo isNil ifTrue:[ self errorNotOpen ].
     self zerror:errorNo.
 !
 
@@ -360,7 +360,7 @@
 	errorNo = __MKSMALLINT( _errorNo );
     }
 %}.
-    errorNo ifNil:[ self errorNotOpen ].
+    errorNo isNil ifTrue:[ self errorNotOpen ].
     self zerror:errorNo.
 !
 
@@ -430,7 +430,7 @@
 	RETURN( self );
     }
 %}.
-    zstream ifNil:[ self errorNotOpen ].
+    zstream isNil ifTrue:[ self errorNotOpen ].
     self invalidArgument.
 ! !