We have blocks & scopes

src/lex/keyword.rs

@@ -3,6 +3,7 @@ use super::{ whitespace_chars, Token };
 #[derive(Debug)]
 pub enum Keyword {
 	Let,
+	Fn,
 }
 
 macro_rules! match_keyword {
@@ -15,5 +16,6 @@ macro_rules! match_keyword {
 
 pub fn parse_keyword(input: &str) -> Option<(Token, &str)> {
 	match_keyword!("let", Token::Kw(Keyword::Let), input);
+	match_keyword!("fn", Token::Kw(Keyword::Fn), input);
 	None
 }

src/lex/symbol.rs

@@ -4,6 +4,8 @@ use super::Token;
 pub enum Symbol {
 	EqualSign,
 	Semicolon,
+	OpenBrace,
+	CloseBrace,
 }
 
 pub fn parse_symbol(input: &str) -> Option<(Token, &str)> {
@@ -12,6 +14,8 @@ pub fn parse_symbol(input: &str) -> Option<(Token, &str)> {
 	match c {
 		'=' => Some((Token::Sym(Symbol::EqualSign), input)),
 		';' => Some((Token::Sym(Symbol::Semicolon), input)),
+		'{' => Some((Token::Sym(Symbol::OpenBrace), input)),
+		'}' => Some((Token::Sym(Symbol::CloseBrace), input)),
 		_ => None
 	}
 }