token: reserve "and", "or", "in" as keywords

src/lexer.rs

@@ -235,6 +235,7 @@ impl<'t> Lexer<'t> {
         let token = self.produce(TKind::Identifier);
         Ok(Token {
             kind: match lexeme {
+                "and" => TKind::And,
                 "as" => TKind::As,
                 "break" => TKind::Break,
                 "const" => TKind::Const,
@@ -244,11 +245,13 @@ impl<'t> Lexer<'t> {
                 "fn" => TKind::Fn,
                 "for" => TKind::For,
                 "if" => TKind::If,
+                "in" => TKind::In,
                 "let" => TKind::Let,
                 "loop" => TKind::Loop,
                 "macro" => TKind::Macro,
                 "match" => TKind::Match,
                 "mod" => TKind::Module,
+                "or" => TKind::Or,
                 "pub" => TKind::Public,
                 "return" => TKind::Return,
                 "struct" => TKind::Struct,

src/token.rs

@@ -56,6 +56,7 @@ impl std::fmt::Display for Lexeme {
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum TKind {
     Comment,
+    And,
     As,
     Break,
     Const,
@@ -65,11 +66,13 @@ pub enum TKind {
     Fn,
     For,
     If,
+    In,
     Let,
     Loop,
     Macro,
     Match,
     Module,
+    Or,
     Public,
     Return,
     Struct,