error: Consistently use Display instead of error description()

The description method is deprecated and its signature forces less
helpful error messages than what Display can provide.

BUG=none
TEST=cargo check --all-features
TEST=cargo check --target aarch64-unknown-linux-gnu

Change-Id: I27fc99d59d0ef457c5273dc53e4c563ef439c2c0
Reviewed-on: https://chromium-review.googlesource.com/1497735
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>

1 files changed, 12 insertions, 12 deletions

diff --git a/kernel_cmdline/src/kernel_cmdline.rs b/kernel_cmdline/src/kernel_cmdline.rs
index 1e1870e..7284004 100644
--- a/kernel_cmdline/src/kernel_cmdline.rs
+++ b/kernel_cmdline/src/kernel_cmdline.rs
@@ -4,7 +4,7 @@
 
 //! Helper for creating valid kernel command line strings.
 
-use std::fmt;
+use std::fmt::{self, Display};
 use std::result;
 
 /// The error type for command line building operations.
@@ -20,18 +20,18 @@ pub enum Error {
     TooLarge,
 }
 
-impl fmt::Display for Error {
+impl Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(
-            f,
-            "{}",
-            match *self {
-                Error::InvalidAscii => "string contains non-printable ASCII character",
-                Error::HasSpace => "string contains a space",
-                Error::HasEquals => "string contains an equals sign",
-                Error::TooLarge => "inserting string would make command line too long",
-            }
-        )
+        use self::Error::*;
+
+        let description = match self {
+            InvalidAscii => "string contains non-printable ASCII character",
+            HasSpace => "string contains a space",
+            HasEquals => "string contains an equals sign",
+            TooLarge => "inserting string would make command line too long",
+        };
+
+        write!(f, "{}", description)
     }
 }