cat(1): removed unused code; arg: updated version

Cargo.lock

@@ -6,23 +6,23 @@ version = 3
 name = "arg"
 version = "0.1.0"
 dependencies = [
- "arg 0.3.1",
+ "arg 0.4.1",
 ]
 
 [[package]]
 name = "arg"
-version = "0.3.1"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae60fcba735ceff2193950be268184f45271dd9e9c0823e6d1e9c5d1070caf81"
+checksum = "568bbed0b9810cd4b43c8560ff3c5d2318b29d78fc314818d156bbed7075d394"
 dependencies = [
  "arg-derive",
 ]
 
 [[package]]
 name = "arg-derive"
-version = "0.3.5"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b3d15a8d79dbe95cc2742d3e4394789b3ac3de3909a058ae728d1fc864d1b54"
+checksum = "7e502162a7be4391f8b0cda30b2aecce232cf6214230fe73f95a462e07f42ba2"
 dependencies = [
  "quote",
  "syn",

arg/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-arg = "0.3.1"
+arg = "0.4.1"
 
 [lib]
 crate-type = ["dylib"]

src/cat.rs

@@ -21,7 +21,7 @@ use std::env;
 use std::fs::{ File, read_to_string };
 use std::os::fd::{ AsRawFd, FromRawFd };
 use std::io;
-use std::io::{ BufRead, Read, Write };
+use std::io::{ Read, Write };
 use std::str;
 
 use arg::Args;