[INFO] cloning repository https://github.com/wjlewis/little_scheme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wjlewis/little_scheme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] be5bdc48658ddf85626e38b87afe71f9097d7a54
[INFO] checking wjlewis/little_scheme against master#c756124775121dea0e640652c5ee3c89e3dd0eb4 for pr-154971-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwjlewis%2Flittle_scheme" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/wjlewis/little_scheme
[INFO] finished tweaking git repo https://github.com/wjlewis/little_scheme
[INFO] tweaked toml for git repo https://github.com/wjlewis/little_scheme written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/wjlewis/little_scheme on toolchain c756124775121dea0e640652c5ee3c89e3dd0eb4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c756124775121dea0e640652c5ee3c89e3dd0eb4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/wjlewis/little_scheme 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" "+c756124775121dea0e640652c5ee3c89e3dd0eb4" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+c756124775121dea0e640652c5ee3c89e3dd0eb4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f26415c209fef0b232d56565487994fb29984b6ae3a37b1b295fd2bf4ae639db
[INFO] running `Command { std: "docker" "start" "-a" "f26415c209fef0b232d56565487994fb29984b6ae3a37b1b295fd2bf4ae639db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f26415c209fef0b232d56565487994fb29984b6ae3a37b1b295fd2bf4ae639db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f26415c209fef0b232d56565487994fb29984b6ae3a37b1b295fd2bf4ae639db", kill_on_drop: false }`
[INFO] [stdout] f26415c209fef0b232d56565487994fb29984b6ae3a37b1b295fd2bf4ae639db
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+c756124775121dea0e640652c5ee3c89e3dd0eb4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cdc44a05ad66ed119604c2d2e6a8b2ddf96a48c94faf99acf116cfd89a3e3965
[INFO] running `Command { std: "docker" "start" "-a" "cdc44a05ad66ed119604c2d2e6a8b2ddf96a48c94faf99acf116cfd89a3e3965", kill_on_drop: false }`
[INFO] [stderr]     Checking little_scheme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `obj`
[INFO] [stdout]   --> src/memory/header.rs:97:42
[INFO] [stdout]    |
[INFO] [stdout] 97 |         fn alloc<T: MemWrite>(&mut self, obj: &T) -> usize {
[INFO] [stdout]    |                                          ^^^ help: if this is intentional, prefix it with an underscore: `_obj`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SchemeObj` is never used
[INFO] [stdout]  --> src/data.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub enum SchemeObj {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Heap` is never constructed
[INFO] [stdout]  --> src/heap.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct Heap {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `alloc_bytes`, `alloc_block`, `collect`, `mark`, and `sweep` are never used
[INFO] [stdout]    --> src/heap.rs:25:12
[INFO] [stdout]     |
[INFO] [stdout]  24 | impl Heap {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout]  25 |     pub fn new(size: usize, get_roots: Box<dyn Fn() -> Vec<usize>>) -> Heap {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  45 |     fn alloc_bytes(&mut self, n: usize, attempt_collect: bool) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  81 |     fn alloc_block(&mut self, header: &mut Header, n: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  97 |     fn collect(&mut self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 102 |     fn mark(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 122 |     fn sweep(&mut self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `children` is never used
[INFO] [stdout]    --> src/heap.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn children<M: Mem>(mem: &M, parent_addr: usize) -> Vec<usize> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Mem` is never used
[INFO] [stdout]  --> src/memory.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub trait Mem {
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MemRead` is never used
[INFO] [stdout]   --> src/memory.rs:30:11
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub trait MemRead {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MemWrite` is never used
[INFO] [stdout]   --> src/memory.rs:37:11
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub trait MemWrite {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Header` is never constructed
[INFO] [stdout]   --> src/memory/header.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Header {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/memory/header.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Header {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 23 |     /// Creates a header for a freshly allocated block of memory.
[INFO] [stdout] 24 |     pub fn new(next: usize, size: usize, allocd: bool) -> Header {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "cdc44a05ad66ed119604c2d2e6a8b2ddf96a48c94faf99acf116cfd89a3e3965", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdc44a05ad66ed119604c2d2e6a8b2ddf96a48c94faf99acf116cfd89a3e3965", kill_on_drop: false }`
[INFO] [stdout] cdc44a05ad66ed119604c2d2e6a8b2ddf96a48c94faf99acf116cfd89a3e3965
