[INFO] cloning repository https://github.com/mjul/zai-rust-free-monad-interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mjul/zai-rust-free-monad-interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjul%2Fzai-rust-free-monad-interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjul%2Fzai-rust-free-monad-interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 02be0c8469952d0728710f8bba93d5e713b58411
[INFO] checking mjul/zai-rust-free-monad-interpreter against try#2c4e58eac5a232e49065e517c1cf50b2715ccf85 for pr-140283
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjul%2Fzai-rust-free-monad-interpreter" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mjul/zai-rust-free-monad-interpreter
[INFO] finished tweaking git repo https://github.com/mjul/zai-rust-free-monad-interpreter
[INFO] tweaked toml for git repo https://github.com/mjul/zai-rust-free-monad-interpreter written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mjul/zai-rust-free-monad-interpreter on toolchain 2c4e58eac5a232e49065e517c1cf50b2715ccf85
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2c4e58eac5a232e49065e517c1cf50b2715ccf85" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mjul/zai-rust-free-monad-interpreter 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" "+2c4e58eac5a232e49065e517c1cf50b2715ccf85" "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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2c4e58eac5a232e49065e517c1cf50b2715ccf85" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37949c52eb8ae84286013c3f4fcc08dd835b48a2bd04163a73d4db0bb7ef07d2
[INFO] running `Command { std: "docker" "start" "-a" "37949c52eb8ae84286013c3f4fcc08dd835b48a2bd04163a73d4db0bb7ef07d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37949c52eb8ae84286013c3f4fcc08dd835b48a2bd04163a73d4db0bb7ef07d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37949c52eb8ae84286013c3f4fcc08dd835b48a2bd04163a73d4db0bb7ef07d2", kill_on_drop: false }`
[INFO] [stdout] 37949c52eb8ae84286013c3f4fcc08dd835b48a2bd04163a73d4db0bb7ef07d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2c4e58eac5a232e49065e517c1cf50b2715ccf85" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0859a5b4f4a3e62d62ba7a7e94eb4c39aec1b73909a3b22c2a7568006283f22d
[INFO] running `Command { std: "docker" "start" "-a" "0859a5b4f4a3e62d62ba7a7e94eb4c39aec1b73909a3b22c2a7568006283f22d", kill_on_drop: false }`
[INFO] [stderr]     Checking zai-rust-free-monad-interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `Append` is never constructed
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum MyFunctor<A> {
[INFO] [stdout]   |      --------- variant in this enum
[INFO] [stdout] 3 |     Append(String, String, A),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `append` is never used
[INFO] [stdout]   --> src/main.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl<A> MyFunctor<A> {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 24 |     fn append(s1: String, s2: String, cont: A) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `pure` and `fold` are never used
[INFO] [stdout]   --> src/main.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<A> Free<A> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 45 |     // Create a pure value
[INFO] [stdout] 46 |     fn pure(x: A) -> Self {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 75 |     fn fold<B, G>(self, f: G, pure: impl Fn(A) -> B) -> B
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `free_append` is never used
[INFO] [stdout]    --> src/main.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn free_append(s1: String, s2: String) -> Free<String> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Append` is never constructed
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum MyFunctor<A> {
[INFO] [stdout]   |      --------- variant in this enum
[INFO] [stdout] 3 |     Append(String, String, A),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `append` is never used
[INFO] [stdout]   --> src/main.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl<A> MyFunctor<A> {
[INFO] [stdout]    | -------------------- associated function in this implementation
[INFO] [stdout] 24 |     fn append(s1: String, s2: String, cont: A) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `pure` and `fold` are never used
[INFO] [stdout]   --> src/main.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<A> Free<A> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 45 |     // Create a pure value
[INFO] [stdout] 46 |     fn pure(x: A) -> Self {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 75 |     fn fold<B, G>(self, f: G, pure: impl Fn(A) -> B) -> B
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `free_append` is never used
[INFO] [stdout]    --> src/main.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn free_append(s1: String, s2: String) -> Free<String> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `liftF` should have a snake case name
[INFO] [stdout]   --> src/main.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 |     fn liftF(fa: MyFunctor<Box<Free<A>>>) -> Self {
[INFO] [stdout]    |        ^^^^^ help: convert the identifier to snake case: `lift_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `liftF` should have a snake case name
[INFO] [stdout]   --> src/main.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 |     fn liftF(fa: MyFunctor<Box<Free<A>>>) -> Self {
[INFO] [stdout]    |        ^^^^^ help: convert the identifier to snake case: `lift_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "0859a5b4f4a3e62d62ba7a7e94eb4c39aec1b73909a3b22c2a7568006283f22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0859a5b4f4a3e62d62ba7a7e94eb4c39aec1b73909a3b22c2a7568006283f22d", kill_on_drop: false }`
[INFO] [stdout] 0859a5b4f4a3e62d62ba7a7e94eb4c39aec1b73909a3b22c2a7568006283f22d