From b6e597968c62c69c054df687fec5b81350283e13 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 15 Apr 2021 01:56:03 +0100
Subject: [PATCH] packetframe: Introduce Fuse::get

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/packetframe.rs | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/packetframe.rs b/src/packetframe.rs
index 5403c24e..95b5d18e 100644
--- a/src/packetframe.rs
+++ b/src/packetframe.rs
@@ -44,22 +44,25 @@ pub struct Broken {
   kind: io::ErrorKind,
 }
 
+impl<RW> Fuse<RW> {
+  #[throws(io::Error)]
+  fn get(&mut self) -> &mut RW {
+    self.0.as_mut().map_err(|broken| broken.clone())?
+  }
+}
+
 impl<R:Read> Read for Fuse<R> {
   #[throws(io::Error)]
   fn read(&mut self, buf: &mut [u8]) -> usize {
-    match &mut self.0 {
-      Err(broken) => throw!(broken.clone()),
-      Ok(inner) => {
-        let r = inner.read(buf);
-        if let Err(e) = &r {
-          self.0 = Err(Broken {
-            msg: e.to_string(),
-            kind: e.kind(),
-          });
-        }
-        r?
-      }
+    let inner = self.get()?;
+    let r = inner.read(buf);
+    if let Err(e) = &r {
+      self.0 = Err(Broken {
+        msg: e.to_string(),
+        kind: e.kind(),
+      });
     }
+    r?
   }
 }
 
-- 
2.30.2