[INFO] fetching crate simple_arguments 0.1.1...
[INFO] testing simple_arguments-0.1.1 against master#99e3aef02079e9c10583638520cd0c134dc3a01d for pr-85530
[INFO] extracting crate simple_arguments 0.1.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate simple_arguments 0.1.1 on toolchain 99e3aef02079e9c10583638520cd0c134dc3a01d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple_arguments 0.1.1
[INFO] finished tweaking crates.io crate simple_arguments 0.1.1
[INFO] tweaked toml for crates.io crate simple_arguments 0.1.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate simple_arguments 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f79ca4c24bb124f5d7dc152148e318b89c2878951038600355d6242b62b7791d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f79ca4c24bb124f5d7dc152148e318b89c2878951038600355d6242b62b7791d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f79ca4c24bb124f5d7dc152148e318b89c2878951038600355d6242b62b7791d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f79ca4c24bb124f5d7dc152148e318b89c2878951038600355d6242b62b7791d", kill_on_drop: false }`
[INFO] [stdout] f79ca4c24bb124f5d7dc152148e318b89c2878951038600355d6242b62b7791d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d6ee37c0784610c984b845b945bce7da9529ef29a69a48725015a13be781e9c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3d6ee37c0784610c984b845b945bce7da9529ef29a69a48725015a13be781e9c", kill_on_drop: false }`
[INFO] [stderr]    Compiling simple_arguments v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/lib.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/lib.rs:98:21
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn fill(&mut self, s: &mut dyn Iterator<Item = &str>) -> Result<(), ArgError> {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/lib.rs:114:14
[INFO] [stdout]     |
[INFO] [stdout] 114 |             .or_else(|err| Err(ArgError::Err(format!("error parsing {}", type_name::<T>()))))?;
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fl`
[INFO] [stdout]    --> src/lib.rs:213:29
[INFO] [stdout]     |
[INFO] [stdout] 213 |         flags.sort_by_key(|(name, fl)| name.to_owned());
[INFO] [stdout]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_fl`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_len`
[INFO] [stdout]    --> src/lib.rs:215:7
[INFO] [stdout]     |
[INFO] [stdout] 215 |         let max_len = flags.iter().fold(0, |acc, v| acc + v.0.len());
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:190:11
[INFO] [stdout]     |
[INFO] [stdout] 190 |         for (f, mut v) in flags.into_iter() {
[INFO] [stdout]     |                 ----^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 |             let mut flag = self
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |                 write!(fmt, "out of arguments");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `exec`
[INFO] [stdout]   --> src/bin/main.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let exec = args.next().unwrap();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_exec`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.68s
[INFO] running `Command { std: "docker" "inspect" "3d6ee37c0784610c984b845b945bce7da9529ef29a69a48725015a13be781e9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d6ee37c0784610c984b845b945bce7da9529ef29a69a48725015a13be781e9c", kill_on_drop: false }`
[INFO] [stdout] 3d6ee37c0784610c984b845b945bce7da9529ef29a69a48725015a13be781e9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 714ed6782bcc416075c95c9a9405502593a840bf18d016efd1b276bbf1c559af
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "714ed6782bcc416075c95c9a9405502593a840bf18d016efd1b276bbf1c559af", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/lib.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling simple_arguments v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/lib.rs:98:21
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn fill(&mut self, s: &mut dyn Iterator<Item = &str>) -> Result<(), ArgError> {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/lib.rs:114:14
[INFO] [stdout]     |
[INFO] [stdout] 114 |             .or_else(|err| Err(ArgError::Err(format!("error parsing {}", type_name::<T>()))))?;
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fl`
[INFO] [stdout]    --> src/lib.rs:213:29
[INFO] [stdout]     |
[INFO] [stdout] 213 |         flags.sort_by_key(|(name, fl)| name.to_owned());
[INFO] [stdout]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_fl`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_len`
[INFO] [stdout]    --> src/lib.rs:215:7
[INFO] [stdout]     |
[INFO] [stdout] 215 |         let max_len = flags.iter().fold(0, |acc, v| acc + v.0.len());
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:190:11
[INFO] [stdout]     |
[INFO] [stdout] 190 |         for (f, mut v) in flags.into_iter() {
[INFO] [stdout]     |                 ----^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 |             let mut flag = self
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |                 write!(fmt, "out of arguments");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `exec`
[INFO] [stdout]   --> src/bin/main.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let exec = args.next().unwrap();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_exec`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/lib.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/lib.rs:98:21
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn fill(&mut self, s: &mut dyn Iterator<Item = &str>) -> Result<(), ArgError> {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/lib.rs:114:14
[INFO] [stdout]     |
[INFO] [stdout] 114 |             .or_else(|err| Err(ArgError::Err(format!("error parsing {}", type_name::<T>()))))?;
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fl`
[INFO] [stdout]    --> src/lib.rs:213:29
[INFO] [stdout]     |
[INFO] [stdout] 213 |         flags.sort_by_key(|(name, fl)| name.to_owned());
[INFO] [stdout]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_fl`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_len`
[INFO] [stdout]    --> src/lib.rs:215:7
[INFO] [stdout]     |
[INFO] [stdout] 215 |         let max_len = flags.iter().fold(0, |acc, v| acc + v.0.len());
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:190:11
[INFO] [stdout]     |
[INFO] [stdout] 190 |         for (f, mut v) in flags.into_iter() {
[INFO] [stdout]     |                 ----^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 |             let mut flag = self
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |                 write!(fmt, "out of arguments");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "714ed6782bcc416075c95c9a9405502593a840bf18d016efd1b276bbf1c559af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "714ed6782bcc416075c95c9a9405502593a840bf18d016efd1b276bbf1c559af", kill_on_drop: false }`
[INFO] [stdout] 714ed6782bcc416075c95c9a9405502593a840bf18d016efd1b276bbf1c559af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4304698fa154eef5e49dea78f0ef9ac6936765035f6245417fa85f44a29a6f99
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4304698fa154eef5e49dea78f0ef9ac6936765035f6245417fa85f44a29a6f99", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stdout] running 3 tests
[INFO] [stderr]   --> src/lib.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 | use std::io::Write;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lib.rs:98:21
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn fill(&mut self, s: &mut dyn Iterator<Item = &str>) -> Result<(), ArgError> {
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]    --> src/lib.rs:114:14
[INFO] [stderr]     |
[INFO] [stderr] 114 |             .or_else(|err| Err(ArgError::Err(format!("error parsing {}", type_name::<T>()))))?;
[INFO] [stderr]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `fl`
[INFO] [stderr]    --> src/lib.rs:213:29
[INFO] [stderr]     |
[INFO] [stderr] 213 |         flags.sort_by_key(|(name, fl)| name.to_owned());
[INFO] [stderr]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_fl`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `max_len`
[INFO] [stderr]    --> src/lib.rs:215:7
[INFO] [stderr]     |
[INFO] [stderr] 215 |         let max_len = flags.iter().fold(0, |acc, v| acc + v.0.len());
[INFO] [stderr]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_len`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:190:11
[INFO] [stderr]     |
[INFO] [stderr] 190 |         for (f, mut v) in flags.into_iter() {
[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/lib.rs:192:8
[INFO] [stderr]     |
[INFO] [stderr] 192 |             let mut flag = self
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |                 write!(fmt, "out of arguments");
[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]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]   --> src/lib.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 | use std::io::Write;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lib.rs:98:21
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn fill(&mut self, s: &mut dyn Iterator<Item = &str>) -> Result<(), ArgError> {
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `err`
[INFO] [stderr]    --> src/lib.rs:114:14
[INFO] [stderr]     |
[INFO] [stderr] 114 |             .or_else(|err| Err(ArgError::Err(format!("error parsing {}", type_name::<T>()))))?;
[INFO] [stderr]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `fl`
[INFO] [stderr]    --> src/lib.rs:213:29
[INFO] [stderr]     |
[INFO] [stderr] 213 |         flags.sort_by_key(|(name, fl)| name.to_owned());
[INFO] [stderr]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_fl`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `max_len`
[INFO] [stderr]    --> src/lib.rs:215:7
[INFO] [stderr]     |
[INFO] [stderr] 215 |         let max_len = flags.iter().fold(0, |acc, v| acc + v.0.len());
[INFO] [stderr]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_len`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:190:11
[INFO] [stderr]     |
[INFO] [stderr] 190 |         for (f, mut v) in flags.into_iter() {
[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/lib.rs:192:8
[INFO] [stderr]     |
[INFO] [stderr] 192 |             let mut flag = self
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/lib.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |                 write!(fmt, "out of arguments");
[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]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `exec`
[INFO] [stderr]   --> src/bin/main.rs:17:7
[INFO] [stderr]    |
[INFO] [stderr] 17 |         let exec = args.next().unwrap();
[INFO] [stderr]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_exec`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/simple_arguments-5635ed1e66a71ab1)
[INFO] [stdout] test free_args_test ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/main-4f0ad5905056c2e2)
[INFO] [stdout] test _test ... ok
[INFO] [stderr]    Doc-tests simple_arguments
[INFO] [stdout] test simple_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 4) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.05s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4304698fa154eef5e49dea78f0ef9ac6936765035f6245417fa85f44a29a6f99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4304698fa154eef5e49dea78f0ef9ac6936765035f6245417fa85f44a29a6f99", kill_on_drop: false }`
[INFO] [stdout] 4304698fa154eef5e49dea78f0ef9ac6936765035f6245417fa85f44a29a6f99