From f99a92ccaf0e50d50e11e73c04992fd8375f84fb Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@cybozu.co.jp>
Date: Sun, 25 Feb 2024 21:42:16 +0900
Subject: [PATCH] Fix modulo operator on NaN to emit NaN

---
 src/intrinsic/binary.rs   |  3 +++
 tests/hand_written/mod.rs | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/intrinsic/binary.rs b/src/intrinsic/binary.rs
index 307c66a..ae76d83 100644
--- a/src/intrinsic/binary.rs
+++ b/src/intrinsic/binary.rs
@@ -142,6 +142,9 @@ fn modulo(lhs: Value, rhs: Value) -> Result<Value, QueryExecutionError> {
     use Value::*;
     Ok(match (lhs, rhs) {
         (Number(lhs), Number(rhs)) => {
+            if lhs.is_nan() || rhs.is_nan() {
+                return Ok(Value::number(f64::NAN));
+            }
             let rhs = number_to_i64(rhs);
             if rhs == 0 {
                 return Err(QueryExecutionError::DivModByZero);
diff --git a/tests/hand_written/mod.rs b/tests/hand_written/mod.rs
index c26b79b..06368c2 100644
--- a/tests/hand_written/mod.rs
+++ b/tests/hand_written/mod.rs
@@ -639,6 +639,22 @@ test!(
     "#
 );
 
+test!(
+    modulo_nan,
+    r#"
+    (1, nan) % (1, nan) | isnan
+    "#,
+    r#"
+    null
+    "#,
+    r#"
+    false
+    true
+    true
+    true
+    "#
+);
+
 test!(
     delete1,
     r#"