diff --git a/parser/src/main/kotlin/gay/pizza/pork/parser/Parser.kt b/parser/src/main/kotlin/gay/pizza/pork/parser/Parser.kt
index c88adde..f838275 100644
--- a/parser/src/main/kotlin/gay/pizza/pork/parser/Parser.kt
+++ b/parser/src/main/kotlin/gay/pizza/pork/parser/Parser.kt
@@ -60,7 +60,11 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
   private fun readSymbolCases(): Expression = within {
     val symbol = readSymbolRaw()
     if (next(TokenType.LeftParentheses)) {
-      val arguments = collect(TokenType.RightParentheses, TokenType.Comma) {
+      val arguments = collect(
+        TokenType.RightParentheses,
+        TokenType.Comma,
+        forceConsumeExceptLast = true
+      ) {
         readExpression()
       }
       expect(TokenType.RightParentheses)
@@ -359,13 +363,18 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
   private fun <T> collect(
     peeking: TokenType,
     consuming: TokenType? = null,
+    forceConsumeExceptLast: Boolean = false,
     read: () -> T
   ): List<T> {
     val items = mutableListOf<T>()
     while (!peek(peeking)) {
       val item = read()
       if (consuming != null) {
-        next(consuming)
+        if (!next(consuming)) {
+          if (!peek(peeking)) {
+            expect(consuming)
+          }
+        }
       }
       items.add(item)
     }