[INFO] cloning repository https://github.com/abdo643-HULK/Mobile-Security
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/abdo643-HULK/Mobile-Security" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabdo643-HULK%2FMobile-Security", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabdo643-HULK%2FMobile-Security'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef9e3510c0605a4b97abd791d30cd26005c61386
[INFO] checking abdo643-HULK/Mobile-Security against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabdo643-HULK%2FMobile-Security" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/abdo643-HULK/Mobile-Security
[INFO] finished tweaking git repo https://github.com/abdo643-HULK/Mobile-Security
[INFO] tweaked toml for git repo https://github.com/abdo643-HULK/Mobile-Security written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/abdo643-HULK/Mobile-Security on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/abdo643-HULK/Mobile-Security already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded filedescriptor v0.8.2
[INFO] [stderr]   Downloaded array-macro v2.1.5
[INFO] [stderr]   Downloaded gag v1.0.0
[INFO] [stderr]   Downloaded ciphers v0.1.0
[INFO] [stderr]   Downloaded const-str v0.5.1
[INFO] [stderr]   Downloaded clap v4.0.9
[INFO] [stderr]   Downloaded clap_derive v4.0.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8063d099308f6576da72b07c747e6ccfd751c0cde747c32b6b303a502320afd6
[INFO] running `Command { std: "docker" "start" "-a" "8063d099308f6576da72b07c747e6ccfd751c0cde747c32b6b303a502320afd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8063d099308f6576da72b07c747e6ccfd751c0cde747c32b6b303a502320afd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8063d099308f6576da72b07c747e6ccfd751c0cde747c32b6b303a502320afd6", kill_on_drop: false }`
[INFO] [stdout] 8063d099308f6576da72b07c747e6ccfd751c0cde747c32b6b303a502320afd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a384db59be441c0472de00ea0670142400484a36f29d96d45a2b41f2a5949b75
[INFO] running `Command { std: "docker" "start" "-a" "a384db59be441c0472de00ea0670142400484a36f29d96d45a2b41f2a5949b75", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking once_cell v1.15.0
[INFO] [stderr]     Checking os_str_bytes v6.3.0
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]     Checking array-macro v2.1.5
[INFO] [stderr]     Checking const-str v0.5.1
[INFO] [stderr]     Checking ciphers v0.1.0
[INFO] [stderr]     Checking ex2 v0.1.0 (/opt/rustwide/workdir/exercises/ex2)
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking clap_lex v0.3.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]    Compiling openssl-sys v0.9.76
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling openssl v0.10.42
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.37
[INFO] [stderr]    Compiling clap_derive v4.0.9
[INFO] [stderr]    Compiling openssl-macros v0.1.0
[INFO] [stderr]     Checking thiserror v1.0.37
[INFO] [stderr]     Checking filedescriptor v0.8.2
[INFO] [stderr]     Checking gag v1.0.0
[INFO] [stderr]     Checking clap v4.0.9
[INFO] [stderr]     Checking ex1 v0.1.0 (/opt/rustwide/workdir/exercises/ex1)
[INFO] [stderr]     Checking ex4 v0.1.0 (/opt/rustwide/workdir/exercises/ex4)
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]  --> exercises/ex1/src/enigma/rotor.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[cfg(feature = "debug")]
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]   |
[INFO] [stdout]   = note: no expected values for `feature`
[INFO] [stdout]   = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]   = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/rotor.rs:108:15
[INFO] [stdout]     |
[INFO] [stdout] 108 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]   --> exercises/ex1/src/enigma/mod.rs:94:15
[INFO] [stdout]    |
[INFO] [stdout] 94 |         #[cfg(feature = "debug")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]   --> exercises/ex1/src/enigma/mod.rs:98:15
[INFO] [stdout]    |
[INFO] [stdout] 98 |         #[cfg(feature = "debug")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:106:15
[INFO] [stdout]     |
[INFO] [stdout] 106 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:110:15
[INFO] [stdout]     |
[INFO] [stdout] 110 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:119:15
[INFO] [stdout]     |
[INFO] [stdout] 119 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:123:15
[INFO] [stdout]     |
[INFO] [stdout] 123 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]  --> exercises/ex1/src/enigma/rotor.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[cfg(feature = "debug")]
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]   |
[INFO] [stdout]   = note: no expected values for `feature`
[INFO] [stdout]   = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]   = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/rotor.rs:108:15
[INFO] [stdout]     |
[INFO] [stdout] 108 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]   --> exercises/ex1/src/enigma/mod.rs:94:15
[INFO] [stdout]    |
[INFO] [stdout] 94 |         #[cfg(feature = "debug")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]   --> exercises/ex1/src/enigma/mod.rs:98:15
[INFO] [stdout]    |
[INFO] [stdout] 98 |         #[cfg(feature = "debug")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:106:15
[INFO] [stdout]     |
[INFO] [stdout] 106 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:110:15
[INFO] [stdout]     |
[INFO] [stdout] 110 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:119:15
[INFO] [stdout]     |
[INFO] [stdout] 119 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `debug`
[INFO] [stdout]    --> exercises/ex1/src/enigma/mod.rs:123:15
[INFO] [stdout]     |
[INFO] [stdout] 123 |         #[cfg(feature = "debug")]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `debug` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `print_redirect`
[INFO] [stdout]    --> exercises/ex1/src/one_time_pad.rs:137:13
[INFO] [stdout]     |
[INFO] [stdout] 137 |         let print_redirect = Redirect::stdout(log).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_print_redirect`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `print_redirect`
[INFO] [stdout]    --> exercises/ex1/src/one_time_pad.rs:168:13
[INFO] [stdout]     |
[INFO] [stdout] 168 |         let print_redirect = Redirect::stdout(log).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_print_redirect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> exercises/ex1/src/playfair.rs:74:19
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn matrix(&self) -> Matrix {
[INFO] [stdout]    |                   ^^^^^     ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn matrix(&self) -> Matrix<'_> {
[INFO] [stdout]    |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `print_redirect`
[INFO] [stdout]    --> exercises/ex1/src/one_time_pad.rs:137:13
[INFO] [stdout]     |
[INFO] [stdout] 137 |         let print_redirect = Redirect::stdout(log).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_print_redirect`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `print_redirect`
[INFO] [stdout]    --> exercises/ex1/src/one_time_pad.rs:168:13
[INFO] [stdout]     |
[INFO] [stdout] 168 |         let print_redirect = Redirect::stdout(log).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_print_redirect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> exercises/ex1/src/playfair.rs:74:19
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn matrix(&self) -> Matrix {
[INFO] [stdout]    |                   ^^^^^     ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                   |
[INFO] [stdout]    |                   the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn matrix(&self) -> Matrix<'_> {
[INFO] [stdout]    |                                   ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.71s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: openssl v0.10.42
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 7`
[INFO] running `Command { std: "docker" "inspect" "a384db59be441c0472de00ea0670142400484a36f29d96d45a2b41f2a5949b75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a384db59be441c0472de00ea0670142400484a36f29d96d45a2b41f2a5949b75", kill_on_drop: false }`
[INFO] [stdout] a384db59be441c0472de00ea0670142400484a36f29d96d45a2b41f2a5949b75
