begin variables

lexer/lexer.go

@@ -65,6 +65,8 @@ func (l *Lexer) NextToken() token.Token {
 	switch l.ch {
 	case ';':
 		tok = l.newToken(token.Semicolon)
+	case ':':
+		tok = l.newToken(token.Colon)
 	case '=':
 		if l.peekByte() == '=' {
 			pos := l.position

test.tt

@@ -1,6 +1,11 @@
 fn main() = {
-    if 3 == 2 {
-        if 3 == 3 in 3
-        else 4
-    } else 2
+    hi: i64 = 4;
+
+    if hi == 2 {
+        hi = 3
+    } else {
+        hi = 2
+    }
+
+    hi
 };

token/token.go

@@ -32,6 +32,7 @@ const (
 	Int   TokenType = "INT"
 
 	Semicolon  TokenType = ";"
+	Colon      TokenType = ":"
 	Equal      TokenType = "="
 	OpenParen  TokenType = "("
 	CloseParen TokenType = ")"