[INFO] updating cached repository https://github.com/iemelyanov/simpleast
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 750a9a84df68ba8af63dbe3ad73ea2f6c45b3b89
[INFO] checking iemelyanov/simpleast against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiemelyanov%2Fsimpleast" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iemelyanov/simpleast on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iemelyanov/simpleast
[INFO] finished tweaking git repo https://github.com/iemelyanov/simpleast
[INFO] tweaked toml for git repo https://github.com/iemelyanov/simpleast written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/iemelyanov/simpleast already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0e67dc75dd926f4464d0248a84b6bde5e32645dd4feb9445772e5dc6dbc2019b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0e67dc75dd926f4464d0248a84b6bde5e32645dd4feb9445772e5dc6dbc2019b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0e67dc75dd926f4464d0248a84b6bde5e32645dd4feb9445772e5dc6dbc2019b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e67dc75dd926f4464d0248a84b6bde5e32645dd4feb9445772e5dc6dbc2019b", kill_on_drop: false }`
[INFO] [stdout] 0e67dc75dd926f4464d0248a84b6bde5e32645dd4feb9445772e5dc6dbc2019b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] df321985bbc488c3e1d97d746879f5fc8e8455688c41970499a03d280c971a0b
[INFO] running `Command { std: "docker" "start" "-a" "df321985bbc488c3e1d97d746879f5fc8e8455688c41970499a03d280c971a0b", kill_on_drop: false }`
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking simpleast v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/main.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let tree = Expr::Binary {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tree`
[INFO] [stdout]   --> src/main.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let tree = Expr::Binary {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_tree`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinOp`
[INFO] [stdout]  --> src/main.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum BinOp {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Variable`
[INFO] [stdout]  --> src/main.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 |     enum Variable {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Expr`
[INFO] [stdout]   --> src/main.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |     enum Expr {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play`
[INFO] [stdout]   --> src/main.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn play() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]   --> src/main.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Add,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]   --> src/main.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Sub,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]   --> src/main.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         Div,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]   --> src/main.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         Add,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `String`
[INFO] [stdout]    --> src/main.rs:258:9
[INFO] [stdout]     |
[INFO] [stdout] 258 |         String(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:269:9
[INFO] [stdout]     |
[INFO] [stdout] 269 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]    --> src/main.rs:270:9
[INFO] [stdout]     |
[INFO] [stdout] 270 |         Sub,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]    --> src/main.rs:272:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |         Div,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `repr`
[INFO] [stdout]    --> src/main.rs:351:16
[INFO] [stdout]     |
[INFO] [stdout] 351 |         pub fn repr(&mut self, ast: &dyn Expr<String>) -> String {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:468:9
[INFO] [stdout]     |
[INFO] [stdout] 468 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]    --> src/main.rs:469:9
[INFO] [stdout]     |
[INFO] [stdout] 469 |         Sub,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]    --> src/main.rs:471:9
[INFO] [stdout]     |
[INFO] [stdout] 471 |         Div,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:476:9
[INFO] [stdout]     |
[INFO] [stdout] 476 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinOp`
[INFO] [stdout]  --> src/main.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum BinOp {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Variable`
[INFO] [stdout]  --> src/main.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 |     enum Variable {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Expr`
[INFO] [stdout]   --> src/main.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |     enum Expr {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play`
[INFO] [stdout]   --> src/main.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn play() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]   --> src/main.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         Add,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]   --> src/main.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Sub,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]   --> src/main.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         Div,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]   --> src/main.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |         Add,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `String`
[INFO] [stdout]    --> src/main.rs:258:9
[INFO] [stdout]     |
[INFO] [stdout] 258 |         String(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:269:9
[INFO] [stdout]     |
[INFO] [stdout] 269 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]    --> src/main.rs:270:9
[INFO] [stdout]     |
[INFO] [stdout] 270 |         Sub,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]    --> src/main.rs:272:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |         Div,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `repr`
[INFO] [stdout]    --> src/main.rs:351:16
[INFO] [stdout]     |
[INFO] [stdout] 351 |         pub fn repr(&mut self, ast: &dyn Expr<String>) -> String {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:468:9
[INFO] [stdout]     |
[INFO] [stdout] 468 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sub`
[INFO] [stdout]    --> src/main.rs:469:9
[INFO] [stdout]     |
[INFO] [stdout] 469 |         Sub,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Div`
[INFO] [stdout]    --> src/main.rs:471:9
[INFO] [stdout]     |
[INFO] [stdout] 471 |         Div,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Add`
[INFO] [stdout]    --> src/main.rs:476:9
[INFO] [stdout]     |
[INFO] [stdout] 476 |         Add,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `Command { std: "docker" "inspect" "df321985bbc488c3e1d97d746879f5fc8e8455688c41970499a03d280c971a0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df321985bbc488c3e1d97d746879f5fc8e8455688c41970499a03d280c971a0b", kill_on_drop: false }`
[INFO] [stdout] df321985bbc488c3e1d97d746879f5fc8e8455688c41970499a03d280c971a0b