[INFO] cloning repository https://github.com/mwdev22/dsa
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mwdev22/dsa" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwdev22%2Fdsa", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwdev22%2Fdsa'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c9014365ee33c6341b138591c63fd38c79c611c
[INFO] checking mwdev22/dsa against try#86f78589b09557f70c9db3f56ad1921e0a9f76ef for pr-138438
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmwdev22%2Fdsa" "/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/mwdev22/dsa on toolchain 86f78589b09557f70c9db3f56ad1921e0a9f76ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mwdev22/dsa
[INFO] finished tweaking git repo https://github.com/mwdev22/dsa
[INFO] tweaked toml for git repo https://github.com/mwdev22/dsa written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mwdev22/dsa 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" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1f4ecc6960d4fc5e973243d6b4076ea634c9e878fd9b6f7697e2999cdc64ba2c
[INFO] running `Command { std: "docker" "start" "-a" "1f4ecc6960d4fc5e973243d6b4076ea634c9e878fd9b6f7697e2999cdc64ba2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f4ecc6960d4fc5e973243d6b4076ea634c9e878fd9b6f7697e2999cdc64ba2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f4ecc6960d4fc5e973243d6b4076ea634c9e878fd9b6f7697e2999cdc64ba2c", kill_on_drop: false }`
[INFO] [stdout] 1f4ecc6960d4fc5e973243d6b4076ea634c9e878fd9b6f7697e2999cdc64ba2c
[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" "-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e0329065d206b988da910233d9ad3c96e78676a9ae1c57510594afc4d17f22c
[INFO] running `Command { std: "docker" "start" "-a" "2e0329065d206b988da910233d9ad3c96e78676a9ae1c57510594afc4d17f22c", kill_on_drop: false }`
[INFO] [stderr]     Checking dsa v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/linked_list.rs:25:30
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Node{val: val, next: None}
[INFO] [stdout]    |                              ^^^^ expected `Box<Option<Node<T>>>`, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `Box<Option<linked_list::Node<T>>>`
[INFO] [stdout]                 found enum `Option<_>`
[INFO] [stdout]    = note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
[INFO] [stdout] help: store this in the heap by calling `Box::new`
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Node{val: val, next: Box::new(None)}
[INFO] [stdout]    |                              +++++++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/linked_list.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn insert(&mut self, element: T) {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/linked_list.rs:25:30
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Node{val: val, next: None}
[INFO] [stdout]    |                              ^^^^ expected `Box<Option<Node<T>>>`, found `Option<_>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `Box<Option<linked_list::Node<T>>>`
[INFO] [stdout]                 found enum `Option<_>`
[INFO] [stdout]    = note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
[INFO] [stdout] help: store this in the heap by calling `Box::new`
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Node{val: val, next: Box::new(None)}
[INFO] [stdout]    |                              +++++++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/linked_list.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn insert(&mut self, element: T) {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dsa` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `dsa` (lib test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "2e0329065d206b988da910233d9ad3c96e78676a9ae1c57510594afc4d17f22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e0329065d206b988da910233d9ad3c96e78676a9ae1c57510594afc4d17f22c", kill_on_drop: false }`
[INFO] [stdout] 2e0329065d206b988da910233d9ad3c96e78676a9ae1c57510594afc4d17f22c