1 files changed, 37 insertions, 2 deletions

diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index 374ed5910..13aab1451 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -1,5 +1,5 @@
 //! Missing batteries for standard libraries.
-use std::time::Instant;
+use std::{cmp::Ordering, ops, process, time::Instant};
 
 mod macros;
 pub mod panic_context;
@@ -117,7 +117,12 @@ impl<'a> Iterator for LinesWithEnds<'a> {
     }
 }
 
-// https://github.com/rust-lang/rust/issues/73831
+/// Returns `idx` such that:
+///
+///     ∀ x in slice[..idx]:  pred(x)
+///  && ∀ x in slice[idx..]: !pred(x)
+///
+/// https://github.com/rust-lang/rust/issues/73831
 pub fn partition_point<T, P>(slice: &[T], mut pred: P) -> usize
 where
     P: FnMut(&T) -> bool,
@@ -147,6 +152,36 @@ where
     left
 }
 
+pub fn equal_range_by<T, F>(slice: &[T], mut key: F) -> ops::Range<usize>
+where
+    F: FnMut(&T) -> Ordering,
+{
+    let start = partition_point(slice, |it| key(it) == Ordering::Less);
+    let len = partition_point(&slice[start..], |it| key(it) == Ordering::Equal);
+    start..start + len
+}
+
+pub struct JodChild(pub process::Child);
+
+impl ops::Deref for JodChild {
+    type Target = process::Child;
+    fn deref(&self) -> &process::Child {
+        &self.0
+    }
+}
+
+impl ops::DerefMut for JodChild {
+    fn deref_mut(&mut self) -> &mut process::Child {
+        &mut self.0
+    }
+}
+
+impl Drop for JodChild {
+    fn drop(&mut self) {
+        let _ = self.0.kill();
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;