From 1fb98e5cecc740a0475d6263bb91724cc13bea03 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 7 Mar 2021 18:12:33 +0100
Subject: Add inspect variant for errors

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 src/lib.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 705fecd..9f0a28d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,3 +38,42 @@ impl<F, T, E> ResultInspectRef<F, T> for Result<T, E>
         }
     }
 }
+
+
+pub trait ResultInspectErr<F, E>
+    where F: FnOnce(&E),
+          E: Sized
+{
+    fn inspect_err(self, f: F) -> Self;
+}
+
+pub trait ResultInspectErrRef<F, E>
+    where F: FnOnce(&E),
+          E: Sized
+{
+    fn inspect_err(&self, f: F);
+}
+
+impl<F, T, E> ResultInspectErr<F, E> for Result<T, E>
+    where F: FnOnce(&E),
+          E: Sized
+{
+    fn inspect_err(self, f: F) -> Self {
+        if let Err(ref e) = self.as_ref() {
+            (f)(&e);
+        }
+
+        self
+    }
+}
+
+impl<F, T, E> ResultInspectErrRef<F, E> for Result<T, E>
+    where F: FnOnce(&E),
+          E: Sized
+{
+    fn inspect_err(&self, f: F) {
+        if let Err(ref e) = self {
+            (f)(&e);
+        }
+    }
+}
-- 
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