Make = a keyword

src/parser.rs

@@ -112,8 +112,7 @@ fn statement(tokens: &mut Tokens) -> ParseResult {
 fn let_expression(tokens: &mut Tokens) -> ParseResult {
     expect!(Keyword(Kw::Let), tokens);
     if let Some(&Identifier(ref name)) = tokens.next() {
-        if let Some(&Identifier(ref s)) = tokens.next() {
-            if s == "=" {
+        if let Some(&Keyword(Kw::Assign)) = tokens.next() {
             if let Ok(expr) = expression(tokens) {
                 return Ok(
                     AST::Binding(name.clone(),
@@ -121,7 +120,6 @@ fn let_expression(tokens: &mut Tokens) -> ParseResult {
             }
         }
     }
-    }
 
     return Err("Bad parse in let_expression()".to_string());
 }

src/tokenizer.rs

@@ -21,7 +21,8 @@ pub enum Kw {
     End,
     Let,
     Fn,
-    Null
+    Null,
+    Assign
 }
 
 pub fn tokenize(input: &str) -> Vec<Token> {
@@ -106,6 +107,7 @@ fn handle_identifier(identifier: String) -> Token {
         "end" => Kw::End,
         "fn" => Kw::Fn,
         "null" => Kw::Null,
+        "=" => Kw::Assign,
         _ => return Token::Identifier(identifier)
     };