diff --git a/src/main/kotlin/gay/pizza/pork/eval/Evaluator.kt b/src/main/kotlin/gay/pizza/pork/eval/PorkEvaluator.kt
similarity index 97%
rename from src/main/kotlin/gay/pizza/pork/eval/Evaluator.kt
rename to src/main/kotlin/gay/pizza/pork/eval/PorkEvaluator.kt
index 266bd34..fcedcd1 100644
--- a/src/main/kotlin/gay/pizza/pork/eval/Evaluator.kt
+++ b/src/main/kotlin/gay/pizza/pork/eval/PorkEvaluator.kt
@@ -2,7 +2,7 @@ package gay.pizza.pork.eval
 
 import gay.pizza.pork.ast.*
 
-class Evaluator(root: Scope) : Visitor<Any> {
+class PorkEvaluator(root: Scope) : Visitor<Any> {
   private var currentScope: Scope = root
 
   override fun visitDefine(node: Define): Any {
diff --git a/src/main/kotlin/gay/pizza/pork/main.kt b/src/main/kotlin/gay/pizza/pork/main.kt
index 5aae9a9..fbdc4ac 100644
--- a/src/main/kotlin/gay/pizza/pork/main.kt
+++ b/src/main/kotlin/gay/pizza/pork/main.kt
@@ -2,7 +2,7 @@ package gay.pizza.pork
 
 import gay.pizza.pork.ast.*
 import gay.pizza.pork.eval.Scope
-import gay.pizza.pork.eval.Evaluator
+import gay.pizza.pork.eval.PorkEvaluator
 import gay.pizza.pork.parse.*
 import kotlin.io.path.Path
 import kotlin.io.path.readText
@@ -10,7 +10,7 @@ import kotlin.io.path.readText
 fun main(args: Array<String>) {
   fun eval(ast: Program) {
     val scope = Scope()
-    val evaluator = Evaluator(scope)
+    val evaluator = PorkEvaluator(scope)
     evaluator.visit(ast)
     println("> ${scope.call("main")}")
   }
diff --git a/src/main/kotlin/gay/pizza/pork/parse/PorkTokenizer.kt b/src/main/kotlin/gay/pizza/pork/parse/PorkTokenizer.kt
index fe849d2..e656eac 100644
--- a/src/main/kotlin/gay/pizza/pork/parse/PorkTokenizer.kt
+++ b/src/main/kotlin/gay/pizza/pork/parse/PorkTokenizer.kt
@@ -51,7 +51,7 @@ class PorkTokenizer(val source: CharSource) {
       tokenStart = source.currentIndex
       val char = source.next()
       for (item in TokenType.SingleChars) {
-        if (item.singleChar == char) {
+        if (item.char == char) {
           return Token(item, char.toString())
         }
       }
diff --git a/src/main/kotlin/gay/pizza/pork/parse/TokenType.kt b/src/main/kotlin/gay/pizza/pork/parse/TokenType.kt
index 578cf48..d586677 100644
--- a/src/main/kotlin/gay/pizza/pork/parse/TokenType.kt
+++ b/src/main/kotlin/gay/pizza/pork/parse/TokenType.kt
@@ -1,26 +1,27 @@
 package gay.pizza.pork.parse
 
-enum class TokenType(val singleChar: Char? = null, val keyword: String? = null) {
+enum class TokenType(val char: Char? = null, val keyword: String? = null) {
   Symbol,
   IntLiteral,
-  Equals(singleChar = '='),
-  Plus(singleChar = '+'),
-  Minus(singleChar = '-'),
-  Multiply(singleChar = '*'),
-  Divide(singleChar = '/'),
-  LeftCurly(singleChar = '{'),
-  RightCurly(singleChar = '}'),
-  LeftBracket(singleChar = '['),
-  RightBracket(singleChar = ']'),
-  LeftParentheses(singleChar = '('),
-  RightParentheses(singleChar = ')'),
-  Comma(singleChar = ','),
+  Equals(char = '='),
+  Plus(char = '+'),
+  Minus(char = '-'),
+  Multiply(char = '*'),
+  Divide(char = '/'),
+  LeftCurly(char = '{'),
+  RightCurly(char = '}'),
+  LeftBracket(char = '['),
+  RightBracket(char = ']'),
+  LeftParentheses(char = '('),
+  RightParentheses(char = ')'),
+  Comma(char = ','),
   False(keyword = "false"),
   True(keyword = "true"),
+  In(keyword = "in"),
   EndOfFile;
 
   companion object {
     val Keywords = entries.filter { it.keyword != null }
-    val SingleChars = entries.filter { it.singleChar != null }
+    val SingleChars = entries.filter { it.char != null }
   }
 }