1 files changed, 12 insertions, 0 deletions
diff --git a/src/librustdoc/html/format.rs b/src/librustdoc/html/format.rs
index a453a8b3dcb..0d8284029af 100644
--- a/src/librustdoc/html/format.rs
+++ b/src/librustdoc/html/format.rs
@@ -63,10 +63,22 @@ impl Buffer {
         Buffer { for_html: false, buffer: String::new() }
     }
 
+    crate fn is_empty(&self) -> bool {
+        self.buffer.is_empty()
+    }
+
     crate fn into_inner(self) -> String {
         self.buffer
     }
 
+    crate fn insert_str(&mut self, idx: usize, s: &str) {
+        self.buffer.insert_str(idx, s);
+    }
+
+    crate fn push_str(&mut self, s: &str) {
+        self.buffer.push_str(s);
+    }
+
     // Intended for consumption by write! and writeln! (std::fmt) but without
     // the fmt::Result return type imposed by fmt::Write (and avoiding the trait
     // import).