[INFO] cloning repository https://github.com/slightknack/flex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/slightknack/flex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fslightknack%2Fflex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fslightknack%2Fflex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ed03c457274268946ede5f1f42535c34298d4dd9
[INFO] testing slightknack/flex against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fslightknack%2Fflex" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/slightknack/flex on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/slightknack/flex
[INFO] finished tweaking git repo https://github.com/slightknack/flex
[INFO] tweaked toml for git repo https://github.com/slightknack/flex written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/slightknack/flex already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e08dd727827d9d372ee328b6f5a4867f170bf49184e3d05a5c215e827249b28
[INFO] running `Command { std: "docker" "start" "-a" "8e08dd727827d9d372ee328b6f5a4867f170bf49184e3d05a5c215e827249b28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e08dd727827d9d372ee328b6f5a4867f170bf49184e3d05a5c215e827249b28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e08dd727827d9d372ee328b6f5a4867f170bf49184e3d05a5c215e827249b28", kill_on_drop: false }`
[INFO] [stdout] 8e08dd727827d9d372ee328b6f5a4867f170bf49184e3d05a5c215e827249b28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9870a52142261eb6919222a051c76bf28e574943e16196fd33c2a3549128edb
[INFO] running `Command { std: "docker" "start" "-a" "b9870a52142261eb6919222a051c76bf28e574943e16196fd33c2a3549128edb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling attorand v1.0.1
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling flex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `->`, `where`, or `{`, found keyword `pub`
[INFO] [stdout]    --> src/heap/mod.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 15  | impl Heap {
[INFO] [stdout]     |           - while parsing this item list starting here
[INFO] [stdout] ...
[INFO] [stdout] 120 |     pub fn write_slot(&self, pointer: Pointer, slots: usize)
[INFO] [stdout]     |                                                             - expected one of `->`, `where`, or `{`
[INFO] [stdout] 121 | 
[INFO] [stdout] 122 |     pub fn write(
[INFO] [stdout]     |     ^^^ unexpected token
[INFO] [stdout] ...
[INFO] [stdout] 137 | }
[INFO] [stdout]     | - the item list ends here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BTreeMap`, `BTreeSet`
[INFO] [stdout]  --> src/main.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{BTreeMap, BTreeSet};
[INFO] [stdout]   |                        ^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::Pointer`
[INFO] [stdout]  --> src/code.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::Pointer;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `free` found for mutable reference `&mut Heap` in the current scope
[INFO] [stdout]   --> src/heap/mod.rs:96:18
[INFO] [stdout]    |
[INFO] [stdout] 96 |             self.free(pointer, old);
[INFO] [stdout]    |                  ^^^^-------------- help: remove the arguments
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  field, not a method
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `free` found for mutable reference `&mut Heap` in the current scope
[INFO] [stdout]    --> src/heap/mod.rs:100:18
[INFO] [stdout]     |
[INFO] [stdout] 100 |             self.free(pointer.add(new as u64), old - new);
[INFO] [stdout]     |                  ^^^^------------------------------------ help: remove the arguments
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  field, not a method
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flex` due to 4 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b9870a52142261eb6919222a051c76bf28e574943e16196fd33c2a3549128edb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9870a52142261eb6919222a051c76bf28e574943e16196fd33c2a3549128edb", kill_on_drop: false }`
[INFO] [stdout] b9870a52142261eb6919222a051c76bf28e574943e16196fd33c2a3549128edb