[INFO] cloning repository https://github.com/arupadhy/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arupadhy/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e03e1afea792a0b3192c0a7c77e36ed3d89f9a7c
[INFO] checking arupadhy/rust-playground against try#6713fa75964eb229409a9c6f6f5c418423e313ff for pr-133502-22
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] finished tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] tweaked toml for git repo https://github.com/arupadhy/rust-playground written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/arupadhy/rust-playground on toolchain 6713fa75964eb229409a9c6f6f5c418423e313ff
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/arupadhy/rust-playground 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" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking arupadhy/rust-playground against try#6713fa75964eb229409a9c6f6f5c418423e313ff for pr-133502-22
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] finished tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] tweaked toml for git repo https://github.com/arupadhy/rust-playground written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/arupadhy/rust-playground on toolchain 6713fa75964eb229409a9c6f6f5c418423e313ff
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/arupadhy/rust-playground 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" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c4dd35e46a5ea78f4be9d5ec713a5ea0cf98e310429883bfbc9a5fad8a3ee5c5
[INFO] running `Command { std: "docker" "start" "-a" "c4dd35e46a5ea78f4be9d5ec713a5ea0cf98e310429883bfbc9a5fad8a3ee5c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4dd35e46a5ea78f4be9d5ec713a5ea0cf98e310429883bfbc9a5fad8a3ee5c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4dd35e46a5ea78f4be9d5ec713a5ea0cf98e310429883bfbc9a5fad8a3ee5c5", kill_on_drop: false }`
[INFO] [stdout] c4dd35e46a5ea78f4be9d5ec713a5ea0cf98e310429883bfbc9a5fad8a3ee5c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+6713fa75964eb229409a9c6f6f5c418423e313ff" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a86098ee730e03d9a40acaf731b9c8429f77f65af3840f3ea669a232f8bf0b6d
[INFO] running `Command { std: "docker" "start" "-a" "a86098ee730e03d9a40acaf731b9c8429f77f65af3840f3ea669a232f8bf0b6d", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:36:55
[INFO] [stdout]    |
[INFO] [stdout] 36 |   println!("this is an array borrowed by this method {?}", param);
[INFO] [stdout]    |                                                       ^
[INFO] [stdout]    |                                                       |
[INFO] [stdout]    |                                                       expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                                       help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:36:55
[INFO] [stdout]    |
[INFO] [stdout] 36 |   println!("this is an array borrowed by this method {?}", param);
[INFO] [stdout]    |                                                       ^
[INFO] [stdout]    |                                                       |
[INFO] [stdout]    |                                                       expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                                       help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:40:73
[INFO] [stdout]    |
[INFO] [stdout] 40 |   println!("this is an vector having u8 values borrowed by this method {?}", param);
[INFO] [stdout]    |                                                                         ^
[INFO] [stdout]    |                                                                         |
[INFO] [stdout]    |                                                                         expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                                                         help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:44:46
[INFO] [stdout]    |
[INFO] [stdout] 44 |   println!("this can be called by any slice {?}", param);
[INFO] [stdout]    |                                              ^
[INFO] [stdout]    |                                              |
[INFO] [stdout]    |                                              expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                              help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:40:73
[INFO] [stdout]    |
[INFO] [stdout] 40 |   println!("this is an vector having u8 values borrowed by this method {?}", param);
[INFO] [stdout]    |                                                                         ^
[INFO] [stdout]    |                                                                         |
[INFO] [stdout]    |                                                                         expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                                                         help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `}`, found `?`
[INFO] [stdout]   --> src/slice.rs:44:46
[INFO] [stdout]    |
[INFO] [stdout] 44 |   println!("this can be called by any slice {?}", param);
[INFO] [stdout]    |                                              ^
[INFO] [stdout]    |                                              |
[INFO] [stdout]    |                                              expected `:` before `?` to format with `Debug` in format string
[INFO] [stdout]    |                                              help: add a colon before the format specifier: `:?`
[INFO] [stdout]    |
[INFO] [stdout]    = note: to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut a = 12;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut b = 300;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:200:7
[INFO] [stdout]     |
[INFO] [stdout] 200 |   let mut input = String::from("hello");
[INFO] [stdout]     |       ----^^^^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:209:7
[INFO] [stdout]     |
[INFO] [stdout] 209 |   let mut plural_value = ownership::pluralize(input.clone());
[INFO] [stdout]     |       ----^^^^^^^^^^^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let slice = &arr[0..1];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `triangle`
[INFO] [stdout]    --> src/main.rs:123:5
[INFO] [stdout]     |
[INFO] [stdout] 123 | let triangle = Triangle(10, 35, 35);
[INFO] [stdout]     |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_triangle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let x = data;
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut a = 12;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut b = 300;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `clock`
[INFO] [stdout]    --> src/main.rs:229:14
[INFO] [stdout]     |
[INFO] [stdout] 229 | fn tell_time(clock: Clock) {
[INFO] [stdout]     |              ^^^^^ help: if this is intentional, prefix it with an underscore: `_clock`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:200:7
[INFO] [stdout]     |
[INFO] [stdout] 200 |   let mut input = String::from("hello");
[INFO] [stdout]     |       ----^^^^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:209:7
[INFO] [stdout]     |
[INFO] [stdout] 209 |   let mut plural_value = ownership::pluralize(input.clone());
[INFO] [stdout]     |       ----^^^^^^^^^^^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let slice = &arr[0..1];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `triangle`
[INFO] [stdout]    --> src/main.rs:123:5
[INFO] [stdout]     |
[INFO] [stdout] 123 | let triangle = Triangle(10, 35, 35);
[INFO] [stdout]     |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_triangle`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:197:7
[INFO] [stdout]     |
[INFO] [stdout] 197 |   let x = data;
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `clock`
[INFO] [stdout]    --> src/main.rs:229:14
[INFO] [stdout]     |
[INFO] [stdout] 229 | fn tell_time(clock: Clock) {
[INFO] [stdout]     |              ^^^^^ help: if this is intentional, prefix it with an underscore: `_clock`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-playground` (bin "rust-playground") due to 3 previous errors; 8 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust-playground` (bin "rust-playground" test) due to 3 previous errors; 8 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a86098ee730e03d9a40acaf731b9c8429f77f65af3840f3ea669a232f8bf0b6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a86098ee730e03d9a40acaf731b9c8429f77f65af3840f3ea669a232f8bf0b6d", kill_on_drop: false }`
[INFO] [stdout] a86098ee730e03d9a40acaf731b9c8429f77f65af3840f3ea669a232f8bf0b6d
