From 84ba4bfa9498d0822617394c900d5cdd71f0fcd2 Mon Sep 17 00:00:00 2001
From: Ian Manske <ian.manske@pm.me>
Date: Mon, 22 Apr 2024 18:06:08 -0400
Subject: [PATCH] Add `Record::retain_mut` implementation

---
 crates/nu-protocol/src/value/record.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/crates/nu-protocol/src/value/record.rs b/crates/nu-protocol/src/value/record.rs
index a204e5d78b..6f69ab1b5d 100644
--- a/crates/nu-protocol/src/value/record.rs
+++ b/crates/nu-protocol/src/value/record.rs
@@ -183,8 +183,10 @@ impl Record {
     where
         F: FnMut(&str, &mut Value) -> bool,
     {
-        todo!()
-        // self.inner.retain_mut(|(col, val)| keep(col, val));
+        self.inner = std::mem::take(&mut self.inner)
+            .into_iter()
+            .filter_map(|(col, mut val)| keep(&col, &mut val).then_some((col, val)))
+            .collect();
     }
 
     /// Truncate record to the first `len` elements.