From 40a648cd194b6e26f4860f14d2d0b7d3658f2173 Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Wed, 29 Oct 2025 10:38:57 -0700
Subject: [PATCH] allow ? in identifier name

---
 src/parser/tests/basics.test.ts | 13 +++++++++++++
 src/parser/tokenizer.ts         |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/parser/tests/basics.test.ts b/src/parser/tests/basics.test.ts
index f92e034..0d870a8 100644
--- a/src/parser/tests/basics.test.ts
+++ b/src/parser/tests/basics.test.ts
@@ -36,6 +36,19 @@ describe('Identifier', () => {
       FunctionCallOrIdentifier
         Identifier 𝜋`)
   })
+
+  test('parses identifiers with queries', () => {
+    expect('even? 20').toMatchTree(`
+      FunctionCall
+        Identifier even?
+        PositionalArg
+          Number 20`)
+
+    expect('even?').toMatchTree(`
+      FunctionCallOrIdentifier
+        Identifier even?`)
+  })
+
 })
 
 describe('Unicode Symbol Support', () => {
diff --git a/src/parser/tokenizer.ts b/src/parser/tokenizer.ts
index 6b2e67a..e4fc895 100644
--- a/src/parser/tokenizer.ts
+++ b/src/parser/tokenizer.ts
@@ -119,7 +119,7 @@ const consumeWordToken = (
     }
 
     // Track identifier validity: must be lowercase, digit, dash, or emoji/unicode
-    if (!isLowercaseLetter(ch) && !isDigit(ch) && ch !== 45 /* - */ && !isEmojiOrUnicode(ch)) {
+    if (!isLowercaseLetter(ch) && !isDigit(ch) && ch !== 45 /* - */ && ch !== 63 /* ? */ && !isEmojiOrUnicode(ch)) {
       if (!canBeWord) break
       isValidIdentifier = false
     }