[INFO] cloning repository https://github.com/RayYH/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RayYH/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRayYH%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRayYH%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d4436e512f4a2423bbb2c1f78bde38301758b262
[INFO] testing RayYH/rust-practice against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRayYH%2Frust-practice" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RayYH/rust-practice on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/RayYH/rust-practice
[INFO] finished tweaking git repo https://github.com/RayYH/rust-practice
[INFO] tweaked toml for git repo https://github.com/RayYH/rust-practice written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bea47fff90c5827222522fa4b5cf247d76abcfa179af137a3fe41e31256ee15
[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" "1bea47fff90c5827222522fa4b5cf247d76abcfa179af137a3fe41e31256ee15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bea47fff90c5827222522fa4b5cf247d76abcfa179af137a3fe41e31256ee15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bea47fff90c5827222522fa4b5cf247d76abcfa179af137a3fe41e31256ee15", kill_on_drop: false }`
[INFO] [stdout] 1bea47fff90c5827222522fa4b5cf247d76abcfa179af137a3fe41e31256ee15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7cef13505bf2ed9638519da8ae99547b486ee1d8d76d07c13e1b7b6347366448
[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" "7cef13505bf2ed9638519da8ae99547b486ee1d8d76d07c13e1b7b6347366448", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `simple_value`
[INFO] [stdout]  --> src/comments.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn simple_value() -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `greater_than_five`
[INFO] [stdout]  --> src/control_flows.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn greater_than_five(number: i32) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_divisible`
[INFO] [stdout]   --> src/control_flows.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn is_divisible(number: i32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_echo`
[INFO] [stdout]  --> src/functions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn my_echo(x: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `addition`
[INFO] [stdout]  --> src/functions.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn addition(x: i32, y: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function_bodies`
[INFO] [stdout]   --> src/functions.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn function_bodies() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]  --> src/ownership.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn takes_ownership(some_string: String) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ownership.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn makes_copy(some_integer: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gives_ownership`
[INFO] [stdout]   --> src/ownership.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/ownership.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length_via_reference`
[INFO] [stdout]   --> src/ownership.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn calculate_length_via_reference(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]   --> src/ownership.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn change(some_string: &mut String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_world`
[INFO] [stdout]   --> src/ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn first_world(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/structs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Color`
[INFO] [stdout]   --> src/structs.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/structs.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Rectangle`
[INFO] [stdout]   --> src/structs.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]   --> src/structs.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> src/structs.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/structs.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]  --> src/variables.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn plus_one(x: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `MAX_POINTS`
[INFO] [stdout]   --> src/variables.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | const MAX_POINTS: u32 = 100_000;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.41s
[INFO] running `Command { std: "docker" "inspect" "7cef13505bf2ed9638519da8ae99547b486ee1d8d76d07c13e1b7b6347366448", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cef13505bf2ed9638519da8ae99547b486ee1d8d76d07c13e1b7b6347366448", kill_on_drop: false }`
[INFO] [stdout] 7cef13505bf2ed9638519da8ae99547b486ee1d8d76d07c13e1b7b6347366448
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4730357052cd6249c4586215ebf7e8ab2285f30a03d5e7b2fb2288765926e88f
[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" "4730357052cd6249c4586215ebf7e8ab2285f30a03d5e7b2fb2288765926e88f", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.06s
[INFO] running `Command { std: "docker" "inspect" "4730357052cd6249c4586215ebf7e8ab2285f30a03d5e7b2fb2288765926e88f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4730357052cd6249c4586215ebf7e8ab2285f30a03d5e7b2fb2288765926e88f", kill_on_drop: false }`
[INFO] [stdout] 4730357052cd6249c4586215ebf7e8ab2285f30a03d5e7b2fb2288765926e88f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b74e99f51b5cec1eee3e8b983173d4b474f1e31f6d47ef010ff19bbb66183e24
[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" "b74e99f51b5cec1eee3e8b983173d4b474f1e31f6d47ef010ff19bbb66183e24", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_practice-31cf674574baef99
[INFO] [stdout] 
[INFO] [stdout] running 37 tests
[INFO] [stdout] test control_flows::tests::test_infinite_loop ... ok
[INFO] [stdout] test control_flows::tests::test_is_divisible ... ok
[INFO] [stdout] test data_types::tests::test_compound_tuple_type ... ok
[INFO] [stdout] test data_types::tests::test_scalar_char_type ... ok
[INFO] [stdout] test data_types::tests::test_scalar_floating_point_numbers ... ok
[INFO] [stdout] test data_types::tests::test_scalar_integer_types ... ok
[INFO] [stdout] test data_types::tests::test_scalar_numeric_operations ... ok
[INFO] [stdout] test functions::tests::test_addition ... ok
[INFO] [stdout] test functions::tests::test_echo ... ok
[INFO] [stdout] test functions::tests::test_function_bodies ... ok
[INFO] [stdout] test control_flows::tests::test_conditional_loops_with_while ... ok
[INFO] [stdout] test ownership::tests::test_calculate_length ... ok
[INFO] [stdout] test ownership::tests::test_calculate_length_via_reference ... ok
[INFO] [stdout] test ownership::tests::test_first_world ... ok
[INFO] [stdout] test ownership::tests::test_change_string ... ok
[INFO] [stdout] test ownership::tests::test_ownerships_and_functions ... ok
[INFO] [stdout] test ownership::tests::test_reference_scope ... ok
[INFO] [stdout] test ownership::tests::test_return_values_and_scope ... ok
[INFO] [stdout] test ownership::tests::test_string_clone ... ok
[INFO] [stdout] test ownership::tests::test_string_type ... ok
[INFO] [stdout] test ownership::tests::test_variable_scope ... ok
[INFO] [stdout] test structs::tests::test_rectangle ... ok
[INFO] [stdout] test structs::tests::test_tuple_struct ... ok
[INFO] [stdout] test structs::tests::test_update_struct ... ok
[INFO] [stdout] test variables::tests::test_shadowing ... ok
[INFO] [stdout] test variables::tests::test_plus_one ... ok
[INFO] [stdout] test ownership::tests::test_string_slices ... ok
[INFO] [stdout] test structs::tests::test_build_user ... ok
[INFO] [stdout] test structs::tests::test_user_instance ... ok
[INFO] [stdout] test control_flows::tests::test_return_values_from_loops ... ok
[INFO] [stdout] test control_flows::tests::test_using_if_in_a_let_statement ... ok
[INFO] [stdout] test control_flows::tests::test_loop_through_collection ... ok
[INFO] [stdout] test variables::tests::test_max_points ... ok
[INFO] [stdout] test data_types::tests::test_compound_array_type ... ok
[INFO] [stdout] test data_types::tests::test_scalar_boolean_types ... ok
[INFO] [stdout] test comments::tests::test_simple_value ... ok
[INFO] [stdout] test control_flows::tests::test_greater_than_five ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 37 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b74e99f51b5cec1eee3e8b983173d4b474f1e31f6d47ef010ff19bbb66183e24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b74e99f51b5cec1eee3e8b983173d4b474f1e31f6d47ef010ff19bbb66183e24", kill_on_drop: false }`
[INFO] [stdout] b74e99f51b5cec1eee3e8b983173d4b474f1e31f6d47ef010ff19bbb66183e24