From 35a849233caaa976ff1b77c4fe409c652f396791 Mon Sep 17 00:00:00 2001
From: Jesse Brault <jbrault@mac.com>
Date: Mon, 2 Mar 2026 11:48:41 -0600
Subject: [PATCH] Add extern keyword.

---
 dmc-lib/src/lexer.rs | 7 +++++++
 dmc-lib/src/token.rs | 1 +
 2 files changed, 8 insertions(+)

diff --git a/dmc-lib/src/lexer.rs b/dmc-lib/src/lexer.rs
index 28df445..d8ba93f 100644
--- a/dmc-lib/src/lexer.rs
+++ b/dmc-lib/src/lexer.rs
@@ -89,6 +89,7 @@ impl<'a> Lexer<'a> {
                     "fn" => TokenKind::Fn,
                     "end" => TokenKind::End,
                     "let" => TokenKind::Let,
+                    "extern" => TokenKind::Extern,
                     _ => TokenKind::Identifier,
                 };
                 Token::new(self.position, self.position + prefix.len(), token_kind)
@@ -163,4 +164,10 @@ mod tests {
         assert_next(&mut lexer, TokenKind::Fn, 2);
         assert_eq!(lexer.next(), None);
     }
+    
+    #[test]
+    fn extern_returned() {
+        let mut lexer = Lexer::new("extern");
+        assert_next(&mut lexer, TokenKind::Extern, 6);
+    }
 }
diff --git a/dmc-lib/src/token.rs b/dmc-lib/src/token.rs
index b8bd672..a5cfcf2 100644
--- a/dmc-lib/src/token.rs
+++ b/dmc-lib/src/token.rs
@@ -35,4 +35,5 @@ pub enum TokenKind {
     IntegerLiteral,
     LongLiteral,
     String,
+    Extern
 }