minor implement lexer

test.cval

@@ -1,19 +1,21 @@
-val int s 3; # global
+val int s 3; // global
 
 val [int->int] fib (int n) {
-    return if == n 0 {
+    return if eq n 0 {
         1
     } else {
-        n * fib 
+        mul n fib 
     };
 };
 
 val [->int] main {
     val str line input;
-    val int n to_int line,;
-    if < n 0 {
+    val int n to_int line;
+    if less n 0 {
         print "illegal number"
     } else {
-        print to_str fib n,;
+        print to_str {
+            fib n
+        };
     }
 };