diff --git a/beautiful-racket-demo/precalc-demo/main.rkt b/beautiful-racket-demo/precalc-demo/main.rkt
index 581392b..caeb866 100644
--- a/beautiful-racket-demo/precalc-demo/main.rkt
+++ b/beautiful-racket-demo/precalc-demo/main.rkt
@@ -11,14 +11,13 @@
 (define-lex-abbrev digits (char-set "0123456789"))
 
 (define tokenize-1
-  (lexer-srcloc
+  (lexer
    [whitespace (token lexeme #:skip? #t)]
    [(:or (from/stop-before "#" "\n")
          (from/to "/*" "*/")) (token 'COMMENT #:skip? #t)]
    [reserved-toks lexeme]
    [(:seq (:? "-") (:+ digits)) (token 'INT (string->number lexeme))]
-   [(:+ (:- (:or alphabetic digits) reserved-toks))
-    (token 'ID (string->symbol lexeme))]))
+   [(:+ alphabetic) (token 'ID (string->symbol lexeme))]))
 
 (define-macro top #'#%module-begin)
 
@@ -38,8 +37,6 @@
 (define-macro app #'#%app)
 
 (define (read-syntax src ip)
-  (port-count-lines! ip)
-  (lexer-file-path src)
   (define parse-tree (parse src (λ () (tokenize-1 ip))))
   (strip-bindings
    (with-syntax ([PT parse-tree])
diff --git a/beautiful-racket-demo/precalc-demo/test.rkt b/beautiful-racket-demo/precalc-demo/test.rkt
index 9db0535..84baf46 100644
--- a/beautiful-racket-demo/precalc-demo/test.rkt
+++ b/beautiful-racket-demo/precalc-demo/test.rkt
@@ -1,10 +1,10 @@
 #lang precalc-demo
 fun f(x, y, z) = x + x + x * (y + y) + y * z - z - z
 
-fun g42(z) = f(z, z, z) # line comment
-g42(-10) # = 300
+fun g(z) = f(z, z, z) # line comment
+g(-10) # = 300
 
-fun h() = g42(10)
+fun h() = g(10)
 h() # = 300
 
 fun k(x) = x / 10 / 10 / (x / x)