lexer: produce increment tokens

trunk_lexer/src/lexer.rs

@@ -604,6 +604,12 @@ impl Lexer {
                     it.next();
                     
                     TokenKind::PlusEquals
+                } else if let Some('+') = it.peek() {
+                    self.col += 1;
+
+                    it.next();
+
+                    TokenKind::Increment
                 } else {
                     TokenKind::Plus
                 }

trunk_lexer/src/token.rs

@@ -85,6 +85,7 @@ pub enum TokenKind {
     Identifier(String),
     If,
     Implements,
+    Increment,
     InlineHtml(String),
     Int(i64),
     Interface,
@@ -215,6 +216,7 @@ impl Display for TokenKind {
             Self::Identifier(id) => &id[..],
             Self::If => "if",
             Self::Implements => "implements",
+            Self::Increment => "++",
             Self::InlineHtml(_) => "InlineHtml",
             Self::Int(_) => "int",
             Self::LeftBrace => "{",