[INFO] cloning repository https://github.com/nmeylan/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/nmeylan/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnmeylan%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnmeylan%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 933da4faabf989a6852420f61ae39ec724992c84
[INFO] checking nmeylan/rust-playground against 40527f3e444fde1deb361751bdef9b9e11d1b971+rustflags=--cfg crater_hack --force-warn invalid-c-variadic-arguments for pr-162478
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnmeylan%2Frust-playground" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nmeylan/rust-playground
[INFO] finished tweaking git repo https://github.com/nmeylan/rust-playground
[INFO] tweaked toml for git repo https://github.com/nmeylan/rust-playground written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nmeylan/rust-playground on toolchain 40527f3e444fde1deb361751bdef9b9e11d1b971
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+40527f3e444fde1deb361751bdef9b9e11d1b971" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nmeylan/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" "+40527f3e444fde1deb361751bdef9b9e11d1b971" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded get-size v0.1.1
[INFO] [stderr]   Downloaded get-size-derive v0.1.1
[INFO] [stderr]   Downloaded fixedbitset v0.4.0
[INFO] [stderr]   Downloaded flamer v0.3.0
[INFO] [stderr]   Downloaded thread-id v3.3.0
[INFO] [stderr]   Downloaded petgraph v0.6.0
[INFO] [stderr]   Downloaded serde_json v1.0.72
[INFO] [stderr]   Downloaded flame v0.2.2
[INFO] [stderr]   Downloaded libc v0.2.106
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b
[INFO] running `Command { std: "docker" "start" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b" "/opt/rustwide/cargo-home/bin/cargo" "+40527f3e444fde1deb361751bdef9b9e11d1b971" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid --cfg crater_hack --force-warn invalid-c-variadic-arguments" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b" "/opt/rustwide/cargo-home/bin/cargo" "+40527f3e444fde1deb361751bdef9b9e11d1b971" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]     Checking fixedbitset v0.4.0
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling tokio v1.13.0
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking petgraph v0.6.0
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]    Compiling tokio-macros v1.5.1
[INFO] [stderr]    Compiling get-size-derive v0.1.1
[INFO] [stderr]     Checking get-size v0.1.1
[INFO] [stderr]    Compiling flame v0.2.2
[INFO] [stderr]    Compiling flamer v0.3.0
[INFO] [stderr]     Checking sandbox v0.1.0 (/opt/rustwide/workdir/sandbox)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> sandbox/label/main.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut result = false;
[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: unused variable: `result`
[INFO] [stdout]  --> sandbox/label/main.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut result = false;
[INFO] [stdout]   |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `waste_time` is assigned to, but never used
[INFO] [stdout]   --> sandbox/flame/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut waste_time = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_waste_time` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `waste_time` is never read
[INFO] [stdout]   --> sandbox/flame/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         waste_time += i
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> sandbox/lifetime/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut parent = Node {
[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]   --> sandbox/lifetime/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut node = Node {
[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]  --> sandbox/label/main.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut result = false;
[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: unused variable: `result`
[INFO] [stdout]  --> sandbox/label/main.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut result = false;
[INFO] [stdout]   |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x`, `y`, `a`, and `parent` are never read
[INFO] [stdout]   --> sandbox/lifetime/main.rs:8:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | struct Node<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  8 |     x: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout]  9 |     y: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 10 |     a: &'a A,
[INFO] [stdout]    |     ^
[INFO] [stdout] 11 |     parent: Option<&'a Node<'a>>
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::default::default`
[INFO] [stdout]  --> sandbox/hasher/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::default::default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^-------
[INFO] [stdout]   |                   |
[INFO] [stdout]   |                   no `default` in `default`
[INFO] [stdout]   |
[INFO] [stdout] help: a similar name exists in the module
[INFO] [stdout]   |
[INFO] [stdout] 5 - use std::default::default;
[INFO] [stdout] 5 + use std::default::Default;
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this module instead
[INFO] [stdout]   |
[INFO] [stdout] 5 - use std::default::default;
[INFO] [stdout] 5 + use std::default;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u64Hasher` should have an upper camel case name
[INFO] [stdout]  --> sandbox/hasher/main.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct u64Hasher {
[INFO] [stdout]   |        ^^^^^^^^^ help: convert the identifier to upper camel case: `U64hasher`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `default_free_fn`
[INFO] [stdout]  --> sandbox/hasher/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(default_free_fn)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sandbox` (bin "hasher") due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `y` is never read
[INFO] [stdout]  --> sandbox/rcrefcell/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct A {
[INFO] [stdout]   |        - field in this struct
[INFO] [stdout] 5 |     x: u16,
[INFO] [stdout] 6 |     y: u16,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> sandbox/lifetime/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut parent = Node {
[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]   --> sandbox/lifetime/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut node = Node {
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x`, `y`, `a`, and `parent` are never read
[INFO] [stdout]   --> sandbox/lifetime/main.rs:8:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | struct Node<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout]  8 |     x: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout]  9 |     y: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 10 |     a: &'a A,
[INFO] [stdout]    |     ^
[INFO] [stdout] 11 |     parent: Option<&'a Node<'a>>
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `waste_time` is assigned to, but never used
[INFO] [stdout]   --> sandbox/flame/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut waste_time = 0;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_waste_time` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `waste_time` is never read
[INFO] [stdout]   --> sandbox/flame/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         waste_time += i
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find type `Cow` in this scope
[INFO] [stdout]  --> sandbox/graph/main.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     pub token: Cow<>
[INFO] [stdout]   |                ^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this enum
[INFO] [stdout]   |
[INFO] [stdout] 1 + use std::borrow::Cow;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::default::default`
[INFO] [stdout]  --> sandbox/hasher/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::default::default;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^-------
[INFO] [stdout]   |                   |
[INFO] [stdout]   |                   no `default` in `default`
[INFO] [stdout]   |
[INFO] [stdout] help: a similar name exists in the module
[INFO] [stdout]   |
[INFO] [stdout] 5 - use std::default::default;
[INFO] [stdout] 5 + use std::default::Default;
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this module instead
[INFO] [stdout]   |
[INFO] [stdout] 5 - use std::default::default;
[INFO] [stdout] 5 + use std::default;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u64Hasher` should have an upper camel case name
[INFO] [stdout]  --> sandbox/hasher/main.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct u64Hasher {
[INFO] [stdout]   |        ^^^^^^^^^ help: convert the identifier to upper camel case: `U64hasher`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]  --> sandbox/graph/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let g = UnGraph::<i32, ()>::from_edges(&[
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `default_free_fn`
[INFO] [stdout]  --> sandbox/hasher/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(default_free_fn)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find type `Cow` in this scope
[INFO] [stdout]  --> sandbox/graph/main.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     pub token: Cow<>
[INFO] [stdout]   |                ^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this enum
[INFO] [stdout]   |
[INFO] [stdout] 1 + use std::borrow::Cow;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0635.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sandbox` (bin "graph") due to 1 previous error; 1 warning emitted
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]  --> sandbox/graph/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let g = UnGraph::<i32, ()>::from_edges(&[
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `y` is never read
[INFO] [stdout]  --> sandbox/rcrefcell/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct A {
[INFO] [stdout]   |        - field in this struct
[INFO] [stdout] 5 |     x: u16,
[INFO] [stdout] 6 |     y: u16,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sandbox` (bin "graph" test) due to 1 previous error; 1 warning emitted
[INFO] [stderr] error: could not compile `sandbox` (bin "hasher" test) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: unused dependency `flamer`
[INFO] [stderr]   --> sandbox/Cargo.toml:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | flamer = "0.3"
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `cargo::unused_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the dependency on `flamer`
[INFO] [stderr] warning: `sandbox` (manifest) generated 1 warning
[INFO] running `Command { std: "docker" "inspect" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b", kill_on_drop: false }`
[INFO] [stdout] 37593a4c20d5bf9c778106b7b9988be393032af8065bdc8df50d5d92a760c80b
