diff --git a/crates/language/src/buffer.rs b/crates/language/src/buffer.rs
index d34528c784..d1beff9dd5 100644
--- a/crates/language/src/buffer.rs
+++ b/crates/language/src/buffer.rs
@@ -23,7 +23,6 @@ use std::{
     ffi::OsString,
     future::Future,
     iter::{Iterator, Peekable},
-    mem,
     ops::{Deref, DerefMut, Range},
     path::{Path, PathBuf},
     str,
@@ -794,8 +793,7 @@ impl Buffer {
         }
 
         drop(edits_since_save);
-        let mut diagnostics = mem::take(&mut self.diagnostics);
-        diagnostics.reset(
+        let new_diagnostics = DiagnosticSet::new(
             diagnostics_by_group_id
                 .into_values()
                 .flat_map(|mut diagnostics| {
@@ -806,9 +804,9 @@ impl Buffer {
                     primary.diagnostic.is_primary = true;
                     diagnostics
                 }),
-            self,
+            content,
         );
-        self.diagnostics = diagnostics;
+        self.diagnostics = new_diagnostics;
 
         if let Some(version) = version {
             let language_server = self.language_server.as_mut().unwrap();
diff --git a/crates/language/src/diagnostic_set.rs b/crates/language/src/diagnostic_set.rs
index 0a04ef17e8..b67a2fe835 100644
--- a/crates/language/src/diagnostic_set.rs
+++ b/crates/language/src/diagnostic_set.rs
@@ -37,20 +37,22 @@ impl DiagnosticSet {
         }
     }
 
-    pub fn reset<I>(&mut self, iter: I, buffer: &text::Snapshot)
+    pub fn new<I>(iter: I, buffer: &text::Snapshot) -> Self
     where
         I: IntoIterator<Item = DiagnosticEntry<PointUtf16>>,
     {
         let mut entries = iter.into_iter().collect::<Vec<_>>();
         entries.sort_unstable_by_key(|entry| (entry.range.start, Reverse(entry.range.end)));
-        self.diagnostics = SumTree::from_iter(
-            entries.into_iter().map(|entry| DiagnosticEntry {
-                range: buffer.anchor_before(entry.range.start)
-                    ..buffer.anchor_after(entry.range.end),
-                diagnostic: entry.diagnostic,
-            }),
-            buffer,
-        );
+        Self {
+            diagnostics: SumTree::from_iter(
+                entries.into_iter().map(|entry| DiagnosticEntry {
+                    range: buffer.anchor_before(entry.range.start)
+                        ..buffer.anchor_after(entry.range.end),
+                    diagnostic: entry.diagnostic,
+                }),
+                buffer,
+            ),
+        }
     }
 
     pub fn iter(&self) -> impl Iterator<Item = &DiagnosticEntry<Anchor>> {