[INFO] cloning repository https://github.com/EthanTheMaster/qr-transmitter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EthanTheMaster/qr-transmitter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEthanTheMaster%2Fqr-transmitter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEthanTheMaster%2Fqr-transmitter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fdc7f3048053444640b2ccfb65b1699ff79688ef
[INFO] testing EthanTheMaster/qr-transmitter against 1.90.0 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEthanTheMaster%2Fqr-transmitter" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/EthanTheMaster/qr-transmitter
[INFO] finished tweaking git repo https://github.com/EthanTheMaster/qr-transmitter
[INFO] tweaked toml for git repo https://github.com/EthanTheMaster/qr-transmitter written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/EthanTheMaster/qr-transmitter on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/EthanTheMaster/qr-transmitter 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f0c884eadedc4bd9b1295a9bc0c69a94103a87e9740f643caf9f0c5a791c7019
[INFO] running `Command { std: "docker" "start" "-a" "f0c884eadedc4bd9b1295a9bc0c69a94103a87e9740f643caf9f0c5a791c7019", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0c884eadedc4bd9b1295a9bc0c69a94103a87e9740f643caf9f0c5a791c7019", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0c884eadedc4bd9b1295a9bc0c69a94103a87e9740f643caf9f0c5a791c7019", kill_on_drop: false }`
[INFO] [stdout] f0c884eadedc4bd9b1295a9bc0c69a94103a87e9740f643caf9f0c5a791c7019
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f08552de94a7fb7bcdc26a4b7445288a776bf11fffb7970ab337f40b0ac356ad
[INFO] running `Command { std: "docker" "start" "-a" "f08552de94a7fb7bcdc26a4b7445288a776bf11fffb7970ab337f40b0ac356ad", kill_on_drop: false }`
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[INFO] [stderr]    Compiling piston2d-graphics v0.30.0
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[INFO] [stderr]    Compiling checked_int_cast v1.0.0
[INFO] [stderr]    Compiling gfx_device_gl v0.15.5
[INFO] [stderr]    Compiling pistoncore-input v0.24.0
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[INFO] [stderr]    Compiling piston2d-gfx_graphics v0.56.0
[INFO] [stderr]    Compiling pistoncore-window v0.36.0
[INFO] [stderr]    Compiling pistoncore-event_loop v0.41.0
[INFO] [stderr]    Compiling piston v0.41.0
[INFO] [stderr]    Compiling qrcode v0.6.0
[INFO] [stderr]    Compiling smithay-client-toolkit v0.4.4
[INFO] [stderr]    Compiling winit v0.18.1
[INFO] [stderr]    Compiling pistoncore-glutin_window v0.53.1
[INFO] [stderr]    Compiling piston_window v0.88.0
[INFO] [stderr]    Compiling qr_transmit v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `qrcode::Version`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use qrcode::Version;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/main.rs:71:52
[INFO] [stdout]    |
[INFO] [stdout] 71 | ...                   combined_packets = (value as u32);
[INFO] [stdout]    |                                          ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 71 -                                 combined_packets = (value as u32);
[INFO] [stdout] 71 +                                 combined_packets = value as u32;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::thread::sleep_ms`: replaced by `std::thread::sleep`
[INFO] [stdout]    --> src/main.rs:111:21
[INFO] [stdout]     |
[INFO] [stdout] 111 |             thread::sleep_ms(60);
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/lt_code.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let n = chunk_size;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `value` is never read
[INFO] [stdout]   --> src/main.rs:41:25
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 let mut value = 0.0;
[INFO] [stdout]    |                         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut fountain = lt_code::Fountain::new( message.as_ref(), size as u32, c,delta);
[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: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lt_code.rs:48:22
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain {
[INFO] [stdout]    |                      ^^^^^ the lifetime is elided here              -------- the same lifetime is hidden 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] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain<'_> {
[INFO] [stdout]    |                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `S` should have a snake case name
[INFO] [stdout]   --> src/lt_code.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |         let S = c * (chunk_size as f64).powf(0.5) * ((chunk_size as f64) / delta).ln();
[INFO] [stdout]    |             ^ help: convert the identifier to snake case (notice the capitalization): `s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3m 29s
[INFO] running `Command { std: "docker" "inspect" "f08552de94a7fb7bcdc26a4b7445288a776bf11fffb7970ab337f40b0ac356ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f08552de94a7fb7bcdc26a4b7445288a776bf11fffb7970ab337f40b0ac356ad", kill_on_drop: false }`
[INFO] [stdout] f08552de94a7fb7bcdc26a4b7445288a776bf11fffb7970ab337f40b0ac356ad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d911769d8cb76658ba6fcfa774e42a0142e975473bd834bc6623d33f1dd532f8
[INFO] running `Command { std: "docker" "start" "-a" "d911769d8cb76658ba6fcfa774e42a0142e975473bd834bc6623d33f1dd532f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling qr_transmit v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `qrcode::Version`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use qrcode::Version;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/main.rs:71:52
[INFO] [stdout]    |
[INFO] [stdout] 71 | ...                   combined_packets = (value as u32);
[INFO] [stdout]    |                                          ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 71 -                                 combined_packets = (value as u32);
[INFO] [stdout] 71 +                                 combined_packets = value as u32;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::thread::sleep_ms`: replaced by `std::thread::sleep`
[INFO] [stdout]    --> src/main.rs:111:21
[INFO] [stdout]     |
[INFO] [stdout] 111 |             thread::sleep_ms(60);
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/lt_code.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let n = chunk_size;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `value` is never read
[INFO] [stdout]   --> src/main.rs:41:25
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 let mut value = 0.0;
[INFO] [stdout]    |                         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     let mut fountain = lt_code::Fountain::new( message.as_ref(), size as u32, c,delta);
[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: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lt_code.rs:48:22
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain {
[INFO] [stdout]    |                      ^^^^^ the lifetime is elided here              -------- the same lifetime is hidden 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] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain<'_> {
[INFO] [stdout]    |                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `S` should have a snake case name
[INFO] [stdout]   --> src/lt_code.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |         let S = c * (chunk_size as f64).powf(0.5) * ((chunk_size as f64) / delta).ln();
[INFO] [stdout]    |             ^ help: convert the identifier to snake case (notice the capitalization): `s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `Command { std: "docker" "inspect" "d911769d8cb76658ba6fcfa774e42a0142e975473bd834bc6623d33f1dd532f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d911769d8cb76658ba6fcfa774e42a0142e975473bd834bc6623d33f1dd532f8", kill_on_drop: false }`
[INFO] [stdout] d911769d8cb76658ba6fcfa774e42a0142e975473bd834bc6623d33f1dd532f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7971da9b84715265d12da8a23a2577821f623e9b5ace4d3176d6292ea82b900c
[INFO] running `Command { std: "docker" "start" "-a" "7971da9b84715265d12da8a23a2577821f623e9b5ace4d3176d6292ea82b900c", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `qrcode::Version`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use qrcode::Version;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]   --> src/main.rs:71:52
[INFO] [stderr]    |
[INFO] [stderr] 71 | ...                   combined_packets = (value as u32);
[INFO] [stderr]    |                                          ^            ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 71 -                                 combined_packets = (value as u32);
[INFO] [stderr] 71 +                                 combined_packets = value as u32;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated function `std::thread::sleep_ms`: replaced by `std::thread::sleep`
[INFO] [stderr]    --> src/main.rs:111:21
[INFO] [stderr]     |
[INFO] [stderr] 111 |             thread::sleep_ms(60);
[INFO] [stderr]     |                     ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/lt_code.rs:52:13
[INFO] [stderr]    |
[INFO] [stderr] 52 |         let n = chunk_size;
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `value` is never read
[INFO] [stderr]   --> src/main.rs:41:25
[INFO] [stderr]    |
[INFO] [stderr] 41 |                 let mut value = 0.0;
[INFO] [stderr]    |                         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:107:9
[INFO] [stderr]     |
[INFO] [stderr] 107 |     let mut fountain = lt_code::Fountain::new( message.as_ref(), size as u32, c,delta);
[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: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/lt_code.rs:48:22
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain {
[INFO] [stderr]    |                      ^^^^^ the lifetime is elided here              -------- the same lifetime is hidden here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub fn new(data: &[u8], chunk_size: u32, c: f64, delta: f64) -> Fountain<'_> {
[INFO] [stderr]    |                                                                             ++++
[INFO] [stderr] 
[INFO] [stderr] warning: variable `S` should have a snake case name
[INFO] [stderr]   --> src/lt_code.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |         let S = c * (chunk_size as f64).powf(0.5) * ((chunk_size as f64) / delta).ln();
[INFO] [stderr]    |             ^ help: convert the identifier to snake case (notice the capitalization): `s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `qr_transmit` (bin "qr_transmit" test) generated 8 warnings (run `cargo fix --bin "qr_transmit" --tests` to apply 3 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/qr_transmit-1c348a2f0f067af7)
[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] running `Command { std: "docker" "inspect" "7971da9b84715265d12da8a23a2577821f623e9b5ace4d3176d6292ea82b900c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7971da9b84715265d12da8a23a2577821f623e9b5ace4d3176d6292ea82b900c", kill_on_drop: false }`
[INFO] [stdout] 7971da9b84715265d12da8a23a2577821f623e9b5ace4d3176d6292ea82b900c
