[INFO] updating cached repository pontuslaestadius/ftp-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pontuslaestadius/ftp-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pontuslaestadius/ftp-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/pontuslaestadius/ftp-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pontuslaestadius/ftp-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pontuslaestadius/ftp-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 10ae254549c0d4c88f0f4e7c91e132405818891b
[INFO] sha for GitHub repo pontuslaestadius/ftp-rust: 10ae254549c0d4c88f0f4e7c91e132405818891b
[INFO] validating manifest of pontuslaestadius/ftp-rust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of pontuslaestadius/ftp-rust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing pontuslaestadius/ftp-rust
[INFO] finished frobbing pontuslaestadius/ftp-rust
[INFO] frobbed toml for pontuslaestadius/ftp-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/pontuslaestadius/ftp-rust/Cargo.toml
[INFO] started frobbing pontuslaestadius/ftp-rust
[INFO] finished frobbing pontuslaestadius/ftp-rust
[INFO] frobbed toml for pontuslaestadius/ftp-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust/Cargo.toml
[INFO] crate pontuslaestadius/ftp-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing pontuslaestadius/ftp-rust against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b852d203be50d10bcc5f542a4b36fef8b0701f5a22015c144c3c8e9404dce08e
[INFO] running `"docker" "start" "-a" "b852d203be50d10bcc5f542a4b36fef8b0701f5a22015c144c3c8e9404dce08e"`
[INFO] [stderr]    Compiling ftp-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/ftp/mod.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `OpenOptions`
[INFO] [stderr]  --> src/ftp/server/mod.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/ftp/server/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/decode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/decode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/encode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/encode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/ftp/server/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]   --> src/ftp/mod.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                     ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `port`
[INFO] [stderr]   --> src/ftp/mod.rs:55:36
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                                    ^^^^ help: consider prefixing with an underscore: `_port`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/ftp/server/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut c: usize;
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stream`
[INFO] [stderr]   --> src/ftp/server/mod.rs:46:22
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn notify_client_err(stream: &mut TcpStream, error: io::Error) {
[INFO] [stderr]    |                      ^^^^^^ help: consider prefixing with an underscore: `_stream`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]  --> src/ftp/client/mod.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn start(address: &str) {
[INFO] [stderr]   |              ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `client`
[INFO] [stderr]   --> src/ftp/client/mod.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |         let (mut stream, client) = super::client::new(self.address)?;
[INFO] [stderr]    |                          ^^^^^^ help: consider prefixing with an underscore: `_client`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_size` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut decoded_size: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_size` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_pktn` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut decoded_pktn: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_pktn` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_size` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:40:27
[INFO] [stderr]    |
[INFO] [stderr] 40 |                 "size" => decoded_size = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_pktn` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 "pktn" => decoded_pktn = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/ftp/encode.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let size = content.len();
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/mod.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut f = OpenOptions::new()
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ftp/mod.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let mut files = "examples/files/foo.txt";
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut stream = stream.unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/client/mod.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut stream = super::connect(address)?;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/decode.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |         let mut rows = section2.next().unwrap().split(';');
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/encode.rs:24:53
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn from_meta_data(metadata: metadata::Metadata, mut content: &mut String) -> Result<Vec<String>, io::Error> {
[INFO] [stderr]    |                                                     ----^^^^^^^
[INFO] [stderr]    |                                                     |
[INFO] [stderr]    |                                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/client/mod.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             self.action(input.as_str());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/encode.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     file.read_to_string(&mut content);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/ftp/mod.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `OpenOptions`
[INFO] [stderr]  --> src/ftp/server/mod.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/ftp/server/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/decode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/decode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/encode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/encode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/ftp/server/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]   --> src/ftp/mod.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                     ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `port`
[INFO] [stderr]   --> src/ftp/mod.rs:55:36
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                                    ^^^^ help: consider prefixing with an underscore: `_port`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/ftp/server/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut c: usize;
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stream`
[INFO] [stderr]   --> src/ftp/server/mod.rs:46:22
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn notify_client_err(stream: &mut TcpStream, error: io::Error) {
[INFO] [stderr]    |                      ^^^^^^ help: consider prefixing with an underscore: `_stream`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]  --> src/ftp/client/mod.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn start(address: &str) {
[INFO] [stderr]   |              ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `client`
[INFO] [stderr]   --> src/ftp/client/mod.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |         let (mut stream, client) = super::client::new(self.address)?;
[INFO] [stderr]    |                          ^^^^^^ help: consider prefixing with an underscore: `_client`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_size` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut decoded_size: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_size` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_pktn` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut decoded_pktn: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_pktn` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_size` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:40:27
[INFO] [stderr]    |
[INFO] [stderr] 40 |                 "size" => decoded_size = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_pktn` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 "pktn" => decoded_pktn = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/ftp/encode.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let size = content.len();
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/mod.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut f = OpenOptions::new()
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ftp/mod.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let mut files = "examples/files/foo.txt";
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut stream = stream.unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/client/mod.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut stream = super::connect(address)?;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/decode.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |         let mut rows = section2.next().unwrap().split(';');
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/encode.rs:24:53
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn from_meta_data(metadata: metadata::Metadata, mut content: &mut String) -> Result<Vec<String>, io::Error> {
[INFO] [stderr]    |                                                     ----^^^^^^^
[INFO] [stderr]    |                                                     |
[INFO] [stderr]    |                                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/client/mod.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             self.action(input.as_str());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/encode.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     file.read_to_string(&mut content);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.28s
[INFO] running `"docker" "inspect" "b852d203be50d10bcc5f542a4b36fef8b0701f5a22015c144c3c8e9404dce08e"`
[INFO] running `"docker" "rm" "-f" "b852d203be50d10bcc5f542a4b36fef8b0701f5a22015c144c3c8e9404dce08e"`
[INFO] [stdout] b852d203be50d10bcc5f542a4b36fef8b0701f5a22015c144c3c8e9404dce08e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 5d1fbb63a619558067e2e08e8dda1234fe6f3f4e1e8d1e8af4f326a0098f121a
[INFO] running `"docker" "start" "-a" "5d1fbb63a619558067e2e08e8dda1234fe6f3f4e1e8d1e8af4f326a0098f121a"`
[INFO] [stderr]    Compiling ftp-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/ftp/mod.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `OpenOptions`
[INFO] [stderr]  --> src/ftp/server/mod.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/ftp/server/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/decode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/decode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/encode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/encode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/ftp/server/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]   --> src/ftp/mod.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                     ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `port`
[INFO] [stderr]   --> src/ftp/mod.rs:55:36
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                                    ^^^^ help: consider prefixing with an underscore: `_port`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/ftp/server/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut c: usize;
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stream`
[INFO] [stderr]   --> src/ftp/server/mod.rs:46:22
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn notify_client_err(stream: &mut TcpStream, error: io::Error) {
[INFO] [stderr]    |                      ^^^^^^ help: consider prefixing with an underscore: `_stream`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]  --> src/ftp/client/mod.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn start(address: &str) {
[INFO] [stderr]   |              ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `client`
[INFO] [stderr]   --> src/ftp/client/mod.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |         let (mut stream, client) = super::client::new(self.address)?;
[INFO] [stderr]    |                          ^^^^^^ help: consider prefixing with an underscore: `_client`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_size` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut decoded_size: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_size` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_pktn` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut decoded_pktn: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_pktn` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_size` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:40:27
[INFO] [stderr]    |
[INFO] [stderr] 40 |                 "size" => decoded_size = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_pktn` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 "pktn" => decoded_pktn = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/ftp/encode.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let size = content.len();
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]  --> src/ftp/mod.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `OpenOptions`
[INFO] [stderr]  --> src/ftp/server/mod.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |               ^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/ftp/server/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/decode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/decode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/ftp/encode.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/ftp/encode.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/mod.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut f = OpenOptions::new()
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ftp/mod.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let mut files = "examples/files/foo.txt";
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut stream = stream.unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/client/mod.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut stream = super::connect(address)?;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/decode.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |         let mut rows = section2.next().unwrap().split(';');
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/encode.rs:24:53
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn from_meta_data(metadata: metadata::Metadata, mut content: &mut String) -> Result<Vec<String>, io::Error> {
[INFO] [stderr]    |                                                     ----^^^^^^^
[INFO] [stderr]    |                                                     |
[INFO] [stderr]    |                                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/client/mod.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             self.action(input.as_str());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/encode.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     file.read_to_string(&mut content);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/ftp/server/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]   --> src/ftp/mod.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                     ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `port`
[INFO] [stderr]   --> src/ftp/mod.rs:55:36
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn start_server(address: &str, port: &str) {
[INFO] [stderr]    |                                    ^^^^ help: consider prefixing with an underscore: `_port`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/ftp/server/mod.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let mut c: usize;
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stream`
[INFO] [stderr]   --> src/ftp/server/mod.rs:46:22
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn notify_client_err(stream: &mut TcpStream, error: io::Error) {
[INFO] [stderr]    |                      ^^^^^^ help: consider prefixing with an underscore: `_stream`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]  --> src/ftp/client/mod.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn start(address: &str) {
[INFO] [stderr]   |              ^^^^^^^ help: consider prefixing with an underscore: `_address`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `client`
[INFO] [stderr]   --> src/ftp/client/mod.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |         let (mut stream, client) = super::client::new(self.address)?;
[INFO] [stderr]    |                          ^^^^^^ help: consider prefixing with an underscore: `_client`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_size` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut decoded_size: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_size` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable `decoded_pktn` is assigned to, but never used
[INFO] [stderr]   --> src/ftp/decode.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut decoded_pktn: &str = "";
[INFO] [stderr]    |             ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_decoded_pktn` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_size` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:40:27
[INFO] [stderr]    |
[INFO] [stderr] 40 |                 "size" => decoded_size = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `decoded_pktn` is never read
[INFO] [stderr]   --> src/ftp/decode.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 "pktn" => decoded_pktn = value,
[INFO] [stderr]    |                           ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `size`
[INFO] [stderr]   --> src/ftp/encode.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let size = content.len();
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_size`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/mod.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut f = OpenOptions::new()
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ftp/mod.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let mut files = "examples/files/foo.txt";
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut stream = stream.unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/server/mod.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut string: String = String::new();
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/client/mod.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut stream = super::connect(address)?;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/decode.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |         let mut rows = section2.next().unwrap().split(';');
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ftp/encode.rs:24:53
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn from_meta_data(metadata: metadata::Metadata, mut content: &mut String) -> Result<Vec<String>, io::Error> {
[INFO] [stderr]    |                                                     ----^^^^^^^
[INFO] [stderr]    |                                                     |
[INFO] [stderr]    |                                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/client/mod.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             self.action(input.as_str());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/ftp/encode.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     file.read_to_string(&mut content);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `"docker" "inspect" "5d1fbb63a619558067e2e08e8dda1234fe6f3f4e1e8d1e8af4f326a0098f121a"`
[INFO] running `"docker" "rm" "-f" "5d1fbb63a619558067e2e08e8dda1234fe6f3f4e1e8d1e8af4f326a0098f121a"`
[INFO] [stdout] 5d1fbb63a619558067e2e08e8dda1234fe6f3f4e1e8d1e8af4f326a0098f121a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pontuslaestadius/ftp-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 911c56704c13d71f49a976c6cd11da0379aab957659b671c34c0b6637c84b287
[INFO] running `"docker" "start" "-a" "911c56704c13d71f49a976c6cd11da0379aab957659b671c34c0b6637c84b287"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ftp_rust-90e3cc8373e38cc8
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ftp_rust-d9ccffdf7fc3964e
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ftp-rust
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "911c56704c13d71f49a976c6cd11da0379aab957659b671c34c0b6637c84b287"`
[INFO] running `"docker" "rm" "-f" "911c56704c13d71f49a976c6cd11da0379aab957659b671c34c0b6637c84b287"`
[INFO] [stdout] 911c56704c13d71f49a976c6cd11da0379aab957659b671c34c0b6637c84b287