[INFO] cloning repository https://github.com/mingjingc/hello-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mingjingc/hello-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmingjingc%2Fhello-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmingjingc%2Fhello-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 10dc568ad4ae6769f92aca26a2450be5a9ed8670
[INFO] checking mingjingc/hello-rust against master#85c39893a761fe4c050523278da4e7e45ab42b6e for pr-134688
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmingjingc%2Fhello-rust" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mingjingc/hello-rust on toolchain 85c39893a761fe4c050523278da4e7e45ab42b6e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mingjingc/hello-rust
[INFO] finished tweaking git repo https://github.com/mingjingc/hello-rust
[INFO] tweaked toml for git repo https://github.com/mingjingc/hello-rust written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mingjingc/hello-rust 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" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45dae5f41c091f2e2a64e17ecbd5374be559d05110fffd3b98f672eb8493c3ba
[INFO] running `Command { std: "docker" "start" "-a" "45dae5f41c091f2e2a64e17ecbd5374be559d05110fffd3b98f672eb8493c3ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45dae5f41c091f2e2a64e17ecbd5374be559d05110fffd3b98f672eb8493c3ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45dae5f41c091f2e2a64e17ecbd5374be559d05110fffd3b98f672eb8493c3ba", kill_on_drop: false }`
[INFO] [stdout] 45dae5f41c091f2e2a64e17ecbd5374be559d05110fffd3b98f672eb8493c3ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a5cd66d8fed9364409f5db97889253e015dcb4a02170535d75e5f16dee9fb2d5
[INFO] running `Command { std: "docker" "start" "-a" "a5cd66d8fed9364409f5db97889253e015dcb4a02170535d75e5f16dee9fb2d5", kill_on_drop: false }`
[INFO] [stderr]     Checking hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::arch::is_aarch64_feature_detected`
[INFO] [stdout]  --> src/bin/conversion.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::arch::is_aarch64_feature_detected;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `long_lived_binding`
[INFO] [stdout]   --> src/bin/virable.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let long_lived_binding = 5_f32;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_long_lived_binding`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_integer`
[INFO] [stdout]   --> src/bin/virable.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let mutable_integer = mutable_integer;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/virable.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut mutable_integer = 7i32;
[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: unused variable: `long_lived_binding`
[INFO] [stdout]   --> src/bin/virable.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let long_lived_binding = 5_f32;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_long_lived_binding`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_integer`
[INFO] [stdout]   --> src/bin/virable.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let mutable_integer = mutable_integer;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/virable.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut mutable_integer = 7i32;
[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: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/bin/expressions.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/bin/flowofcontroll.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/bin/conversion.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Number {
[INFO] [stdout]   |        ------ field in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/bin/flowofcontroll.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::arch::is_aarch64_feature_detected`
[INFO] [stdout]  --> src/bin/conversion.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::arch::is_aarch64_feature_detected;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/bin/flowofcontroll.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |             break 'outer; // 这步会直接跳出outer循环
[INFO] [stdout]    |             ------------ any code following this expression is unreachable
[INFO] [stdout] 42 |         }
[INFO] [stdout] 43 |         println!("This point will never be reached");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/bin/flowofcontroll.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |             break 'outer; // 这步会直接跳出outer循环
[INFO] [stdout]    |             ------------ any code following this expression is unreachable
[INFO] [stdout] 42 |         }
[INFO] [stdout] 43 |         println!("This point will never be reached");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/match.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |         (1, y, z) => println!("First is `0`, `y` is {:?}, and `z` is {:?}", y, z),
[INFO] [stdout]    |         --------- matches all the relevant values
[INFO] [stdout] 52 |         (1, ..) => println!("First is `1` and the rest doesn't matter"),
[INFO] [stdout]    |         ^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/match.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         i  => println!("Less than zero"),
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Fahrenheit` is never constructed
[INFO] [stdout]   --> src/bin/match.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Temperture {
[INFO] [stdout]    |      ---------- variant in this enum
[INFO] [stdout] 16 |     Celsius(i32),
[INFO] [stdout] 17 |     Fahrenheit(i32),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/bin/if.rs:77:21
[INFO] [stdout]    |
[INFO] [stdout] 77 |     if let Foo::Qux(value @ 100) = c {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/bin/conversion.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Number {
[INFO] [stdout]   |        ------ field in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/match.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |         (1, y, z) => println!("First is `0`, `y` is {:?}, and `z` is {:?}", y, z),
[INFO] [stdout]    |         --------- matches all the relevant values
[INFO] [stdout] 52 |         (1, ..) => println!("First is `1` and the rest doesn't matter"),
[INFO] [stdout]    |         ^^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/match.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         i  => println!("Less than zero"),
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/bin/if.rs:77:21
[INFO] [stdout]    |
[INFO] [stdout] 77 |     if let Foo::Qux(value @ 100) = c {
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Fahrenheit` is never constructed
[INFO] [stdout]   --> src/bin/match.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Temperture {
[INFO] [stdout]    |      ---------- variant in this enum
[INFO] [stdout] 16 |     Celsius(i32),
[INFO] [stdout] 17 |     Fahrenheit(i32),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/bin/expressions.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "a5cd66d8fed9364409f5db97889253e015dcb4a02170535d75e5f16dee9fb2d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5cd66d8fed9364409f5db97889253e015dcb4a02170535d75e5f16dee9fb2d5", kill_on_drop: false }`
[INFO] [stdout] a5cd66d8fed9364409f5db97889253e015dcb4a02170535d75e5f16dee9fb2d5