fix `nil?' type inference

diff --git a/module/language/cps/type-fold.scm b/module/language/cps/type-fold.scm
index b7649df..db22843 100644 (file)
--- a/module/language/cps/type-fold.scm
+++ b/module/language/cps/type-fold.scm
@@ -67,7 +67,6 @@
 ;; All the cases that are in compile-bytecode.
 (define-unary-type-predicate-folder pair? &pair)
 (define-unary-type-predicate-folder null? &null)
-(define-unary-type-predicate-folder nil? &nil)
 (define-unary-type-predicate-folder symbol? &symbol)
 (define-unary-type-predicate-folder variable? &box)
 (define-unary-type-predicate-folder vector? &vector)