1 files changed, 6 insertions, 0 deletions
diff --git a/src/libcore/fmt/builders.rs b/src/libcore/fmt/builders.rs
index 32d6aa19c64..22f0215f0ad 100644
--- a/src/libcore/fmt/builders.rs
+++ b/src/libcore/fmt/builders.rs
@@ -175,6 +175,12 @@ impl<'a, 'b: 'a> DebugTuple<'a, 'b> {
     fn is_pretty(&self) -> bool {
         self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
     }
+
+    /// Returns the wrapped `Formatter`.
+    #[unstable(feature = "debug_builder_formatter", reason = "recently added")]
+    pub fn formatter(&mut self) -> &mut fmt::Formatter<'b> {
+        &mut self.fmt
+    }
 }
 
 struct DebugInner<'a, 'b: 'a> {