From 4b9d766f555d26af2a691fbe65e71196104febc0 Mon Sep 17 00:00:00 2001
From: Ewen McNeill <ewen@naos.co.nz>
Date: Tue, 10 Jan 2023 16:26:50 +1300
Subject: [PATCH] ch8: wraperror2: remove map_err() call

To match the book text (Listing 8.15, which is supposed to match
ch8/misc/wraperror2.rs, actually remove the map_err() calls that
are not supposed to be needed once the std::convert::From trait
is implemented for the wrapped types.
---
 ch8/misc/wraperror2.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ch8/misc/wraperror2.rs b/ch8/misc/wraperror2.rs
index 645e5ca0..a5b9c273 100644
--- a/ch8/misc/wraperror2.rs
+++ b/ch8/misc/wraperror2.rs
@@ -29,8 +29,8 @@ impl From<net::AddrParseError> for UpstreamError {
 }
 
 fn main() -> Result<(), UpstreamError> {
-    let _f = File::open("invisible.txt").map_err(UpstreamError::IO)?;
-    let _localhost = "::1".parse::<Ipv6Addr>().map_err(UpstreamError::Parsing)?;
+    let _f = File::open("invisible.txt")?;
+    let _localhost = "::1".parse::<Ipv6Addr>()?;
 
     Ok(())
-}
\ No newline at end of file
+}