Make ascii_* sets private to characters

src/characters.rs

@@ -7,12 +7,12 @@ use std::iter::FromIterator;
 
 pub type CharSet = HashSet<char>;
 
-pub fn ascii_letters() -> CharSet {
+fn ascii_letters() -> CharSet {
     let letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".chars();
     CharSet::from_iter(letters)
 }
 
-pub fn ascii_digits() -> CharSet {
+fn ascii_digits() -> CharSet {
     let digits = "1234567890".chars();
     CharSet::from_iter(digits)
 }

src/lexer.rs

@@ -31,6 +31,6 @@ impl Iterator for Lexer {
 pub fn hello(person: &str) {
     println!("Hello, {}!", person);
     for (idx, c) in person.char_indices() {
-        println!("  {}, {} -> {}", c, idx, characters::ascii_letters().contains(&c));
+        println!("  {}, {} -> {}", c, idx, characters::identifier_initials().contains(&c));
     }
 }