Add lexer support for angles, which we'll use for casting.

src/syntax/tokens.rs

@@ -40,6 +40,12 @@ pub enum Token {
     #[token(")")]
     RightParen,
 
+    #[token("<")]
+    LessThan,
+
+    #[token(">")]
+    GreaterThan,
+
     // Next we take of any reserved words; I always like to put
     // these before we start recognizing more complicated regular
     // expressions. I don't think it matters, but it works for me.
@@ -89,6 +95,8 @@ impl fmt::Display for Token {
             Token::Semi => write!(f, "';'"),
             Token::LeftParen => write!(f, "'('"),
             Token::RightParen => write!(f, "')'"),
+            Token::LessThan => write!(f, "<"),
+            Token::GreaterThan => write!(f, ">"),
             Token::Print => write!(f, "'print'"),
             Token::Operator(c) => write!(f, "'{}'", c),
             Token::Number((None, otype, v)) => write!(f, "'{}{}'", v, display_optional_type(otype)),