[INFO] cloning repository https://github.com/dsbarnes/linked-lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dsbarnes/linked-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdsbarnes%2Flinked-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdsbarnes%2Flinked-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eb80fb1b74e71e80a83ed6fc146b44a55133819b
[INFO] testing dsbarnes/linked-lists against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdsbarnes%2Flinked-lists" "/workspace/builds/worker-51/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dsbarnes/linked-lists on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dsbarnes/linked-lists
[INFO] finished tweaking git repo https://github.com/dsbarnes/linked-lists
[INFO] tweaked toml for git repo https://github.com/dsbarnes/linked-lists written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate git repo https://github.com/dsbarnes/linked-lists already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7fef98dd5beef340d2938a99c93718328222fc19d81abbf77eaba07006d709ee
[INFO] running `Command { std: "docker" "start" "-a" "7fef98dd5beef340d2938a99c93718328222fc19d81abbf77eaba07006d709ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7fef98dd5beef340d2938a99c93718328222fc19d81abbf77eaba07006d709ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fef98dd5beef340d2938a99c93718328222fc19d81abbf77eaba07006d709ee", kill_on_drop: false }`
[INFO] [stdout] 7fef98dd5beef340d2938a99c93718328222fc19d81abbf77eaba07006d709ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b084a0cae2b4e6b3915948e02b7af3343019c31023fbd1956ef3695cfcc2a94
[INFO] running `Command { std: "docker" "start" "-a" "9b084a0cae2b4e6b3915948e02b7af3343019c31023fbd1956ef3695cfcc2a94", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling linked-lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `:`, `@`, or `|`, found `)`
[INFO] [stdout]   --> src/second.rs:43:22
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(&sefl) -> Option<&T> {
[INFO] [stdout]    |                      ^ expected one of `:`, `@`, or `|`
[INFO] [stdout]    |
[INFO] [stdout]    = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
[INFO] [stdout] help: if this is a `self` type, give it a parameter name
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(self: &sefl) -> Option<&T> {
[INFO] [stdout]    |                 ^^^^^^^^^^^
[INFO] [stdout] help: if this is a parameter name, give it a type
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(sefl: &TypeName) -> Option<&T> {
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^
[INFO] [stdout] help: if this is a type, explicitly ignore the parameter name
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(_: &sefl) -> Option<&T> {
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0424]: expected value, found module `self`
[INFO] [stdout]   --> src/second.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(&sefl) -> Option<&T> {
[INFO] [stdout]    |            ---- this function doesn't have a `self` parameter
[INFO] [stdout] 44 |         self.head.as_ref().map(|node| {
[INFO] [stdout]    |         ^^^^ `self` value is a keyword only available in methods with a `self` parameter
[INFO] [stdout]    |
[INFO] [stdout] help: add a `self` receiver parameter to make the associated `fn` a method
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(&&self, sefl) -> Option<&T> {
[INFO] [stdout]    |                  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]   --> src/second.rs:43:34
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(&sefl) -> Option<&T> {
[INFO] [stdout]    |                                  ^ expected named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: this function's return type contains a borrowed value with an elided lifetime, but the lifetime cannot be derived from the arguments
[INFO] [stdout] help: consider using the `'static` lifetime
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn peek(&sefl) -> Option<&'static T> {
[INFO] [stdout]    |                                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0106, E0424.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `linked-lists` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "9b084a0cae2b4e6b3915948e02b7af3343019c31023fbd1956ef3695cfcc2a94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b084a0cae2b4e6b3915948e02b7af3343019c31023fbd1956ef3695cfcc2a94", kill_on_drop: false }`
[INFO] [stdout] 9b084a0cae2b4e6b3915948e02b7af3343019c31023fbd1956ef3695cfcc2a94