[INFO] cloning repository https://github.com/CarloMicieli/rust_tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CarloMicieli/rust_tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCarloMicieli%2Frust_tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCarloMicieli%2Frust_tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2d779014ddd8a8ad7726e284a9b8ae61a4b081ef
[INFO] checking CarloMicieli/rust_tutorial against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCarloMicieli%2Frust_tutorial" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CarloMicieli/rust_tutorial on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CarloMicieli/rust_tutorial
[INFO] finished tweaking git repo https://github.com/CarloMicieli/rust_tutorial
[INFO] tweaked toml for git repo https://github.com/CarloMicieli/rust_tutorial written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/CarloMicieli/rust_tutorial already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f79e8db06d5eb4ba11bf0690a564806c8fe876cc4b70ffc136fa7258a074b463
[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" "f79e8db06d5eb4ba11bf0690a564806c8fe876cc4b70ffc136fa7258a074b463", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f79e8db06d5eb4ba11bf0690a564806c8fe876cc4b70ffc136fa7258a074b463", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f79e8db06d5eb4ba11bf0690a564806c8fe876cc4b70ffc136fa7258a074b463", kill_on_drop: false }`
[INFO] [stdout] f79e8db06d5eb4ba11bf0690a564806c8fe876cc4b70ffc136fa7258a074b463
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e35e5f2532958e1cf0b0662691f8487d1aa54ee21c2941701cbfba0ae7737cc3
[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" "e35e5f2532958e1cf0b0662691f8487d1aa54ee21c2941701cbfba0ae7737cc3", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `thruth`
[INFO] [stdout]  --> src/control_flow/ifs.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn thruth(x: i32) -> bool {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `if_as_expression`
[INFO] [stdout]  --> src/control_flow/ifs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn if_as_expression(x: i32) -> &'static str {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum`
[INFO] [stdout]  --> src/control_flow/loops.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn sum(from: i32, to: i32) -> i32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum2`
[INFO] [stdout]   --> src/control_flow/loops.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn sum2(from: i32, to: i32) -> i32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum3`
[INFO] [stdout]   --> src/control_flow/loops.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn sum3(from: i32, to: i32) -> i32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Val`
[INFO] [stdout]  --> src/custom_types/expressions.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Val { n: i32 },
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Variable`
[INFO] [stdout]  --> src/custom_types/expressions.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Variable { name: String, exp: Box<Exp> },
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sum`
[INFO] [stdout]  --> src/custom_types/expressions.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Sum { lhs: Box<Exp>, rhs: Box<Exp> },
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `constant`
[INFO] [stdout]   --> src/custom_types/expressions.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn constant(val: i32) -> Exp {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `variable`
[INFO] [stdout]   --> src/custom_types/expressions.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn variable(name: &str, exp: Exp) -> Exp {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sum`
[INFO] [stdout]   --> src/custom_types/expressions.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn sum(lhs: Exp, rhs: Exp) -> Exp {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `eval`
[INFO] [stdout]   --> src/custom_types/expressions.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn eval(exp: &Exp) -> i32 {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `numerator`
[INFO] [stdout]   --> src/custom_types/rational.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn numerator(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `denominator`
[INFO] [stdout]   --> src/custom_types/rational.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn denominator(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from`
[INFO] [stdout]   --> src/custom_types/rational.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn from(num: i32) -> Rational {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum`
[INFO] [stdout]  --> src/functions/functions.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn sum(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DividedByZero`
[INFO] [stdout]  --> src/functions/functions.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     DividedByZero,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `div`
[INFO] [stdout]   --> src/functions/functions.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn div(a: i32, b: i32) -> Result<i32, DivError> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]   --> src/functions/functions.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn fib(n: i32) -> i32 {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max`
[INFO] [stdout]   --> src/functions/functions.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn max<T>(a: T, b: T) -> T
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hello`
[INFO] [stdout]  --> src/primitive_types/strings.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn hello(name: &str) -> String {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the `d:` in this pattern is redundant
[INFO] [stdout]   --> src/custom_types/rational.rs:80:30
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let Rational { n: c, d: d } = other;
[INFO] [stdout]    |                              ^^^^ help: use shorthand field pattern: `d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_shorthand_field_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> src/collections/arrays.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use super::*;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> src/collections/vectors.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use super::*;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the `d:` in this pattern is redundant
[INFO] [stdout]   --> src/custom_types/rational.rs:80:30
[INFO] [stdout]    |
[INFO] [stdout] 80 |         let Rational { n: c, d: d } = other;
[INFO] [stdout]    |                              ^^^^ help: use shorthand field pattern: `d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_shorthand_field_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `Command { std: "docker" "inspect" "e35e5f2532958e1cf0b0662691f8487d1aa54ee21c2941701cbfba0ae7737cc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e35e5f2532958e1cf0b0662691f8487d1aa54ee21c2941701cbfba0ae7737cc3", kill_on_drop: false }`
[INFO] [stdout] e35e5f2532958e1cf0b0662691f8487d1aa54ee21c2941701cbfba0ae7737cc3