[INFO] cloning repository https://github.com/morka17/understanding_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/morka17/understanding_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmorka17%2Funderstanding_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmorka17%2Funderstanding_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cd2b3d8daa9b89944929783690acee497b7b96f2
[INFO] testing morka17/understanding_rust against try#7af779037716ae4125ceabb429791b4cf5dd0a43 for pr-136932
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmorka17%2Funderstanding_rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/morka17/understanding_rust on toolchain 7af779037716ae4125ceabb429791b4cf5dd0a43
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/morka17/understanding_rust
[INFO] finished tweaking git repo https://github.com/morka17/understanding_rust
[INFO] tweaked toml for git repo https://github.com/morka17/understanding_rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/morka17/understanding_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" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d4319dcf27d2007c548a95bc06f6ff7d54b7d145b15780e63822890612a3a786
[INFO] running `Command { std: "docker" "start" "-a" "d4319dcf27d2007c548a95bc06f6ff7d54b7d145b15780e63822890612a3a786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4319dcf27d2007c548a95bc06f6ff7d54b7d145b15780e63822890612a3a786", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4319dcf27d2007c548a95bc06f6ff7d54b7d145b15780e63822890612a3a786", kill_on_drop: false }`
[INFO] [stdout] d4319dcf27d2007c548a95bc06f6ff7d54b7d145b15780e63822890612a3a786
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dcbfcb446bbd96a3a7f349cc37e71c9bfa79facb1baef367a7cfd7c834af3237
[INFO] running `Command { std: "docker" "start" "-a" "dcbfcb446bbd96a3a7f349cc37e71c9bfa79facb1baef367a7cfd7c834af3237", kill_on_drop: false }`
[INFO] [stderr]    Compiling understanding_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `RefCell` and `UnsafeCell`
[INFO] [stdout]   --> src/interior_mutability.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::cell::{RefCell, UnsafeCell};
[INFO] [stdout]    |                 ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]   --> src/interior_mutability.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::sync::Arc;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicUsize` and `Ordering`
[INFO] [stdout]   --> src/interior_mutability.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]    |                         ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `hint` and `thread`
[INFO] [stdout]   --> src/interior_mutability.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::{hint, thread};
[INFO] [stdout]    |           ^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/pointer_type.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "dcbfcb446bbd96a3a7f349cc37e71c9bfa79facb1baef367a7cfd7c834af3237", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcbfcb446bbd96a3a7f349cc37e71c9bfa79facb1baef367a7cfd7c834af3237", kill_on_drop: false }`
[INFO] [stdout] dcbfcb446bbd96a3a7f349cc37e71c9bfa79facb1baef367a7cfd7c834af3237
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 59a562938167511607a69bbf93bf321940c8cb631330b7fd361d9520654fd59e
[INFO] running `Command { std: "docker" "start" "-a" "59a562938167511607a69bbf93bf321940c8cb631330b7fd361d9520654fd59e", kill_on_drop: false }`
[INFO] [stdout] warning: unused imports: `RefCell` and `UnsafeCell`
[INFO] [stdout]   --> src/interior_mutability.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::cell::{RefCell, UnsafeCell};
[INFO] [stdout]    |                 ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]   --> src/interior_mutability.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::sync::Arc;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling understanding_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `AtomicUsize` and `Ordering`
[INFO] [stdout]   --> src/interior_mutability.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stdout]    |                         ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `hint` and `thread`
[INFO] [stdout]   --> src/interior_mutability.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::{hint, thread};
[INFO] [stdout]    |           ^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/pointer_type.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RefCell`
[INFO] [stdout]   --> src/interior_mutability.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::cell::{RefCell, UnsafeCell};
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/pointer_type.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut x = add(5, 7);
[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: function `understanding_unsafeCell` should have a snake case name
[INFO] [stdout]   --> src/interior_mutability.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn understanding_unsafeCell() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `understanding_unsafe_cell`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "59a562938167511607a69bbf93bf321940c8cb631330b7fd361d9520654fd59e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59a562938167511607a69bbf93bf321940c8cb631330b7fd361d9520654fd59e", kill_on_drop: false }`
[INFO] [stdout] 59a562938167511607a69bbf93bf321940c8cb631330b7fd361d9520654fd59e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+7af779037716ae4125ceabb429791b4cf5dd0a43" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3d9cb3efa8c08a897d2888d5698e6722f674bdcd8bbb0c1faad81c1f518decf7
[INFO] running `Command { std: "docker" "start" "-a" "3d9cb3efa8c08a897d2888d5698e6722f674bdcd8bbb0c1faad81c1f518decf7", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `RefCell` and `UnsafeCell`
[INFO] [stderr]   --> src/interior_mutability.rs:10:17
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::cell::{RefCell, UnsafeCell};
[INFO] [stderr]    |                 ^^^^^^^  ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::Arc`
[INFO] [stderr]   --> src/interior_mutability.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::sync::Arc;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `AtomicUsize` and `Ordering`
[INFO] [stderr]   --> src/interior_mutability.rs:12:25
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::sync::atomic::{AtomicUsize, Ordering};
[INFO] [stderr]    |                         ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `hint` and `thread`
[INFO] [stderr]   --> src/interior_mutability.rs:13:11
[INFO] [stderr]    |
[INFO] [stderr] 13 | use std::{hint, thread};
[INFO] [stderr]    |           ^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `add` is never used
[INFO] [stderr]   --> src/pointer_type.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]    |    ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `understanding_rust` (lib) generated 5 warnings (run `cargo fix --lib -p understanding_rust` to apply 4 suggestions)
[INFO] [stderr] warning: unused import: `RefCell`
[INFO] [stderr]   --> src/interior_mutability.rs:10:17
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::cell::{RefCell, UnsafeCell};
[INFO] [stderr]    |                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]   --> src/pointer_type.rs:32:17
[INFO] [stderr]    |
[INFO] [stderr] 32 |         let mut x = add(5, 7);
[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: function `understanding_unsafeCell` should have a snake case name
[INFO] [stderr]   --> src/interior_mutability.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn understanding_unsafeCell() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `understanding_unsafe_cell`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `understanding_rust` (lib test) generated 3 warnings (run `cargo fix --lib -p understanding_rust --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/understanding_rust-7aebde3395dca474)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test interior_mutability::test::understanding_unsafeCell ... ok
[INFO] [stdout] test interior_mutability::test::understanding_refcell ... ok
[INFO] [stdout] test pointer_type::test::binop_works ... ok
[INFO] [stdout] test interior_mutability::test::understanding_atomic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests understanding_rust
[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" "3d9cb3efa8c08a897d2888d5698e6722f674bdcd8bbb0c1faad81c1f518decf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d9cb3efa8c08a897d2888d5698e6722f674bdcd8bbb0c1faad81c1f518decf7", kill_on_drop: false }`
[INFO] [stdout] 3d9cb3efa8c08a897d2888d5698e6722f674bdcd8bbb0c1faad81c1f518decf7