[INFO] cloning repository https://github.com/psatomas/variables-and-mutability
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/psatomas/variables-and-mutability" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpsatomas%2Fvariables-and-mutability", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpsatomas%2Fvariables-and-mutability'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c800fb111a641f7ee0a5d8e5e990fc78c3c912e2
[INFO] testing psatomas/variables-and-mutability/c800fb111a641f7ee0a5d8e5e990fc78c3c912e2 against master#b03b3a7ec92682be2917540b679478d41c95a30c for pr-137122-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpsatomas%2Fvariables-and-mutability" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/psatomas/variables-and-mutability
[INFO] finished tweaking git repo https://github.com/psatomas/variables-and-mutability
[INFO] tweaked toml for git repo https://github.com/psatomas/variables-and-mutability written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/psatomas/variables-and-mutability on toolchain b03b3a7ec92682be2917540b679478d41c95a30c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/psatomas/variables-and-mutability 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" "+b03b3a7ec92682be2917540b679478d41c95a30c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9607b650ae6e4a27183ae0694e417e4d0a3a7ede20a61b07d2f784a7c83fbfe0
[INFO] running `Command { std: "docker" "start" "-a" "9607b650ae6e4a27183ae0694e417e4d0a3a7ede20a61b07d2f784a7c83fbfe0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9607b650ae6e4a27183ae0694e417e4d0a3a7ede20a61b07d2f784a7c83fbfe0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9607b650ae6e4a27183ae0694e417e4d0a3a7ede20a61b07d2f784a7c83fbfe0", kill_on_drop: false }`
[INFO] [stdout] 9607b650ae6e4a27183ae0694e417e4d0a3a7ede20a61b07d2f784a7c83fbfe0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74e3467aa69f45c326016d8e9071f030d9cc6310f6ffc8fe89cabfa1e07f9a10
[INFO] running `Command { std: "docker" "start" "-a" "74e3467aa69f45c326016d8e9071f030d9cc6310f6ffc8fe89cabfa1e07f9a10", kill_on_drop: false }`
[INFO] [stderr]    Compiling variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/intro_to_variables.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grams_of_protein`
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let grams_of_protein = "100.345";
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grams_of_protein`
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let grams_of_protein = 100.345;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `grams_of_protein` is assigned to, but never used
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut grams_of_protein = 100;
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_grams_of_protein` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `grams_of_protein` is never read
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     grams_of_protein = 105;
[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: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/positional_arguments_to_println.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `points_scored` is never read
[INFO] [stdout]   --> src/main.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut points_scored: i32 = 28;
[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: unused variable: `event_time`
[INFO] [stdout]   --> src/main.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let event_time = "06:00";
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/interpolation_with_curly_braces.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "74e3467aa69f45c326016d8e9071f030d9cc6310f6ffc8fe89cabfa1e07f9a10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74e3467aa69f45c326016d8e9071f030d9cc6310f6ffc8fe89cabfa1e07f9a10", kill_on_drop: false }`
[INFO] [stdout] 74e3467aa69f45c326016d8e9071f030d9cc6310f6ffc8fe89cabfa1e07f9a10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ffdb040b7af4f5e38339ec2c9009fda713aca370cc56dfc28f511fc5e6900d5a
[INFO] running `Command { std: "docker" "start" "-a" "ffdb040b7af4f5e38339ec2c9009fda713aca370cc56dfc28f511fc5e6900d5a", kill_on_drop: false }`
[INFO] [stderr]    Compiling variables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `points_scored` is never read
[INFO] [stdout]   --> src/main.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut points_scored: i32 = 28;
[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: unused variable: `event_time`
[INFO] [stdout]   --> src/main.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let event_time = "06:00";
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grams_of_protein`
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let grams_of_protein = "100.345";
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grams_of_protein`
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let grams_of_protein = 100.345;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `grams_of_protein` is assigned to, but never used
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut grams_of_protein = 100;
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_grams_of_protein` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `grams_of_protein` is never read
[INFO] [stdout]  --> src/bin/variable_shadowing.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     grams_of_protein = 105;
[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: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/interpolation_with_curly_braces.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/positional_arguments_to_println.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fruits`
[INFO] [stdout]  --> src/bin/intro_to_variables.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let fruits = apples + oranges;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "ffdb040b7af4f5e38339ec2c9009fda713aca370cc56dfc28f511fc5e6900d5a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffdb040b7af4f5e38339ec2c9009fda713aca370cc56dfc28f511fc5e6900d5a", kill_on_drop: false }`
[INFO] [stdout] ffdb040b7af4f5e38339ec2c9009fda713aca370cc56dfc28f511fc5e6900d5a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+b03b3a7ec92682be2917540b679478d41c95a30c" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] da56e5e5c0a445edd5fccbb804262536748c61df99c4965000c24e6e8b82028a
[INFO] running `Command { std: "docker" "start" "-a" "da56e5e5c0a445edd5fccbb804262536748c61df99c4965000c24e6e8b82028a", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `fruits`
[INFO] [stderr]  --> src/bin/positional_arguments_to_println.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let fruits = apples + oranges;
[INFO] [stderr]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `variables` (bin "positional_arguments_to_println" test) generated 1 warning
[INFO] [stderr] warning: value assigned to `points_scored` is never read
[INFO] [stderr]   --> src/main.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let mut points_scored: i32 = 28;
[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: unused variable: `event_time`
[INFO] [stderr]   --> src/main.rs:44:9
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let event_time = "06:00";
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_time`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `fruits`
[INFO] [stderr]  --> src/bin/interpolation_with_curly_braces.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let fruits = apples + oranges;
[INFO] [stderr]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `fruits`
[INFO] [stderr]  --> src/bin/intro_to_variables.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let fruits = apples + oranges;
[INFO] [stderr]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fruits`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `grams_of_protein`
[INFO] [stderr]  --> src/bin/variable_shadowing.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let grams_of_protein = "100.345";
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `grams_of_protein`
[INFO] [stderr]  --> src/bin/variable_shadowing.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let grams_of_protein = 100.345;
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_grams_of_protein`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `grams_of_protein` is assigned to, but never used
[INFO] [stderr]  --> src/bin/variable_shadowing.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut grams_of_protein = 100;
[INFO] [stderr]   |             ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider using `_grams_of_protein` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `grams_of_protein` is never read
[INFO] [stderr]  --> src/bin/variable_shadowing.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     grams_of_protein = 105;
[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: `variables` (bin "variables" test) generated 2 warnings
[INFO] [stderr] warning: `variables` (bin "interpolation_with_curly_braces" test) generated 1 warning
[INFO] [stderr] warning: `variables` (bin "intro_to_variables" test) generated 1 warning
[INFO] [stderr] warning: `variables` (bin "variable_shadowing" test) generated 4 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/bin/constants.rs (/opt/rustwide/target/debug/deps/constants-697111881174370c)
[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] [stderr]      Running unittests src/bin/immutable_and_mutable_variables.rs (/opt/rustwide/target/debug/deps/immutable_and_mutable_variables-e1590ec58743b7c6)
[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] [stderr]      Running unittests src/bin/interpolation_with_curly_braces.rs (/opt/rustwide/target/debug/deps/interpolation_with_curly_braces-7cbbd09a53b2de3c)
[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] [stderr]      Running unittests src/bin/intro_to_compiler_directives.rs (/opt/rustwide/target/debug/deps/intro_to_compiler_directives-c87aa93ef73eb60d)
[INFO] [stderr]      Running unittests src/bin/intro_to_variables.rs (/opt/rustwide/target/debug/deps/intro_to_variables-32ca6f475aafa2a1)
[INFO] [stderr]      Running unittests src/bin/positional_arguments_to_println.rs (/opt/rustwide/target/debug/deps/positional_arguments_to_println-6c9afd2da1b32e72)
[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 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 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] [stderr]      Running unittests src/bin/scopes.rs (/opt/rustwide/target/debug/deps/scopes-2bfbc4bff9f6b17a)
[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] [stderr]      Running unittests src/bin/type_aliases.rs (/opt/rustwide/target/debug/deps/type_aliases-547cbe75305d47d6)
[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] [stderr]      Running unittests src/bin/underscore_with_variables.rs (/opt/rustwide/target/debug/deps/underscore_with_variables-e5f8c75fa54daaf1)
[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] [stderr]      Running unittests src/bin/variable_shadowing.rs (/opt/rustwide/target/debug/deps/variable_shadowing-300860fbf29040f5)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/variables-95b000713f7599b4)
[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] running `Command { std: "docker" "inspect" "da56e5e5c0a445edd5fccbb804262536748c61df99c4965000c24e6e8b82028a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da56e5e5c0a445edd5fccbb804262536748c61df99c4965000c24e6e8b82028a", kill_on_drop: false }`
[INFO] [stdout] da56e5e5c0a445edd5fccbb804262536748c61df99c4965000c24e6e8b82028a