update

src/token/mod.rs

@@ -0,0 +1,19 @@
+struct Token {
+    type_: String,
+    literal: String,
+}
+
+const ILLEGAL: &str = "ILLEGAL";
+const EOF: &str = "EOF";
+const IDENT: &str = "IDENT";
+const INT: &str = "INT";
+const ASSIGN: &str = "=";
+const PLUS: &str = "+";
+const COMMA: &str = ",";
+const SEMICOLON: &str = ";";
+const LPAREN: &str = "(";
+const RPAREN: &str = ")";
+const LBRACE: &str = "{";
+const RBRACE: &str = "}";
+const FUNCTION: &str = "FUNCTION";
+const LET: &str = "LET";