add space before and after @

frontend/generics1.icl

@@ -3614,7 +3614,7 @@ foldExpr f expr=:(Var _) st
 foldExpr f expr=:(App {app_args}) st 
 	# st = f expr st
 	= foldSt (foldExpr f) app_args st
-foldExpr f expr1=:(expr@exprs) st
+foldExpr f expr1=:(expr @ exprs) st
 	# st = f expr st	
 	= foldSt (foldExpr f) [expr:exprs] st	
 foldExpr f expr=:(Let {let_lazy_binds, let_strict_binds, let_expr}) st