[INFO] cloning repository https://github.com/LinlyBoi/disk-algs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LinlyBoi/disk-algs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLinlyBoi%2Fdisk-algs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLinlyBoi%2Fdisk-algs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e399db98047f82d7453a6e92458577104d9806d2
[INFO] checking LinlyBoi/disk-algs against try#6db1a6a7ebb2ad243051f3ff949f987dd70cde2b+rustflags=-Dreturn-local-variable-ptr for pr-134218
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLinlyBoi%2Fdisk-algs" "/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/LinlyBoi/disk-algs on toolchain 6db1a6a7ebb2ad243051f3ff949f987dd70cde2b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LinlyBoi/disk-algs
[INFO] finished tweaking git repo https://github.com/LinlyBoi/disk-algs
[INFO] tweaked toml for git repo https://github.com/LinlyBoi/disk-algs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/LinlyBoi/disk-algs 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" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "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-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad5fd57526a62345d5fee3117d478ae4a637a1eddb30aa105e170ad2d3417b56
[INFO] running `Command { std: "docker" "start" "-a" "ad5fd57526a62345d5fee3117d478ae4a637a1eddb30aa105e170ad2d3417b56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad5fd57526a62345d5fee3117d478ae4a637a1eddb30aa105e170ad2d3417b56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad5fd57526a62345d5fee3117d478ae4a637a1eddb30aa105e170ad2d3417b56", kill_on_drop: false }`
[INFO] [stdout] ad5fd57526a62345d5fee3117d478ae4a637a1eddb30aa105e170ad2d3417b56
[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 -Dreturn-local-variable-ptr" "-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" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] becd47e7f850578ef7ae84be1200b65ef2eceab5a7961e8f6745a4022db709fd
[INFO] running `Command { std: "docker" "start" "-a" "becd47e7f850578ef7ae84be1200b65ef2eceab5a7961e8f6745a4022db709fd", kill_on_drop: false }`
[INFO] [stderr]     Checking disk_algs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::VecDeque`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:55:10
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn cscan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn scan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[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:138:5
[INFO] [stdout]     |
[INFO] [stdout] 138 |     mut head: i32,
[INFO] [stdout]     |     ----^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `capacity`
[INFO] [stdout]    --> src/main.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |     capacity: usize,
[INFO] [stdout]     |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_capacity`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:55:10
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn cscan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[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: function `cscan` is never used
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn cscan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn scan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fscan` is never used
[INFO] [stdout]    --> src/main.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn fscan(
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:138:5
[INFO] [stdout]     |
[INFO] [stdout] 138 |     mut head: i32,
[INFO] [stdout]     |     ----^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nscan` is never used
[INFO] [stdout]    --> src/main.rs:171:4
[INFO] [stdout]     |
[INFO] [stdout] 171 | fn nscan(
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `capacity`
[INFO] [stdout]    --> src/main.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |     capacity: usize,
[INFO] [stdout]     |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_capacity`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cycle` is never used
[INFO] [stdout]    --> src/main.rs:218:4
[INFO] [stdout]     |
[INFO] [stdout] 218 | fn cycle<T>(slice: &[T], start_pos: usize) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flip` is never used
[INFO] [stdout]    --> src/main.rs:221:4
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn flip(direction: &Direction) -> Direction {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cscan` is never used
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn cscan(mut head: i32, disk_end: i32, mut requests: Vec<i32>, direction: &mut Direction) -> i32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fscan` is never used
[INFO] [stdout]    --> src/main.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn fscan(
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nscan` is never used
[INFO] [stdout]    --> src/main.rs:171:4
[INFO] [stdout]     |
[INFO] [stdout] 171 | fn nscan(
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cycle` is never used
[INFO] [stdout]    --> src/main.rs:218:4
[INFO] [stdout]     |
[INFO] [stdout] 218 | fn cycle<T>(slice: &[T], start_pos: usize) -> impl Iterator<Item = &T> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flip` is never used
[INFO] [stdout]    --> src/main.rs:221:4
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn flip(direction: &Direction) -> Direction {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/main.rs:151:17
[INFO] [stdout]     |
[INFO] [stdout] 151 |                 &q1.push(requests.remove(0));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow 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] 151 |                 let _ = &q1.push(requests.remove(0));
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/main.rs:151:17
[INFO] [stdout]     |
[INFO] [stdout] 151 |                 &q1.push(requests.remove(0));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow 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] 151 |                 let _ = &q1.push(requests.remove(0));
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "becd47e7f850578ef7ae84be1200b65ef2eceab5a7961e8f6745a4022db709fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "becd47e7f850578ef7ae84be1200b65ef2eceab5a7961e8f6745a4022db709fd", kill_on_drop: false }`
[INFO] [stdout] becd47e7f850578ef7ae84be1200b65ef2eceab5a7961e8f6745a4022db709fd