[INFO] cloning repository https://github.com/JikoUnderscore/interpeterbook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JikoUnderscore/interpeterbook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJikoUnderscore%2Finterpeterbook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJikoUnderscore%2Finterpeterbook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 89d0baf6f24e15aa7845cfed5064bfdca2b882d7
[INFO] checking JikoUnderscore/interpeterbook against try#51de2e90f91fdec6cf64ff542a4e15b9c177a797 for pr-147294
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJikoUnderscore%2Finterpeterbook" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/JikoUnderscore/interpeterbook
[INFO] finished tweaking git repo https://github.com/JikoUnderscore/interpeterbook
[INFO] tweaked toml for git repo https://github.com/JikoUnderscore/interpeterbook written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JikoUnderscore/interpeterbook on toolchain 51de2e90f91fdec6cf64ff542a4e15b9c177a797
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/JikoUnderscore/interpeterbook 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" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking JikoUnderscore/interpeterbook against try#51de2e90f91fdec6cf64ff542a4e15b9c177a797 for pr-147294
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJikoUnderscore%2Finterpeterbook" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/JikoUnderscore/interpeterbook
[INFO] finished tweaking git repo https://github.com/JikoUnderscore/interpeterbook
[INFO] tweaked toml for git repo https://github.com/JikoUnderscore/interpeterbook written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JikoUnderscore/interpeterbook on toolchain 51de2e90f91fdec6cf64ff542a4e15b9c177a797
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/JikoUnderscore/interpeterbook 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" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19a2c1f3146a368145d6baa9981b922cada81727e67005a608e1df70c1857d30
[INFO] running `Command { std: "docker" "start" "-a" "19a2c1f3146a368145d6baa9981b922cada81727e67005a608e1df70c1857d30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19a2c1f3146a368145d6baa9981b922cada81727e67005a608e1df70c1857d30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19a2c1f3146a368145d6baa9981b922cada81727e67005a608e1df70c1857d30", kill_on_drop: false }`
[INFO] [stdout] 19a2c1f3146a368145d6baa9981b922cada81727e67005a608e1df70c1857d30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+51de2e90f91fdec6cf64ff542a4e15b9c177a797" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5f30152e8b865db26a87326f397513c0121c0a23f6b0b18d64491b939049651
[INFO] running `Command { std: "docker" "start" "-a" "d5f30152e8b865db26a87326f397513c0121c0a23f6b0b18d64491b939049651", kill_on_drop: false }`
[INFO] [stderr]     Checking interpeterbook v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `Node` is never used
[INFO] [stdout]  --> src/ast.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait Node {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Statement` is never used
[INFO] [stdout]  --> src/ast.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub trait Statement: Node {
[INFO] [stdout]   |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Expression` is never used
[INFO] [stdout]   --> src/ast.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Expression: Node {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/ast.rs:19:18
[INFO] [stdout]    |
[INFO] [stdout] 19 |     LetStatement(LetStatement),
[INFO] [stdout]    |     ------------ ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EStatements` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 19 -     LetStatement(LetStatement),
[INFO] [stdout] 19 +     LetStatement(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/ast.rs:20:21
[INFO] [stdout]    |
[INFO] [stdout] 20 |     ReturnStatement(ReturnStatement),
[INFO] [stdout]    |     --------------- ^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EStatements` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 20 -     ReturnStatement(ReturnStatement),
[INFO] [stdout] 20 +     ReturnStatement(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `token`, `name`, and `value` are never read
[INFO] [stdout]   --> src/ast.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub struct LetStatement {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 58 |     pub token: token::Token,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 59 |     // pub name: &'ls Identifier,
[INFO] [stdout] 60 |     pub name: Identifier,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 61 |     pub value: Option<Identifier>, // TODO remove Option
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LetStatement` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `token` is never read
[INFO] [stdout]    --> src/ast.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 105 | pub struct ReturnStatement {
[INFO] [stdout]     |            --------------- field in this struct
[INFO] [stdout] 106 |     pub token: token::Token,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ReturnStatement` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `token` is never read
[INFO] [stdout]    --> src/ast.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 146 | pub struct Identifier {
[INFO] [stdout]     |            ---------- field in this struct
[INFO] [stdout] 147 |     pub token: token::Token,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Identifier` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExpressionStatement` is never constructed
[INFO] [stdout]    --> src/ast.rs:183:12
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub struct ExpressionStatement {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_str` is never used
[INFO] [stdout]   --> src/token.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | impl RawSlice {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 52 |     #[inline]
[INFO] [stdout] 53 |     pub fn to_str(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Statement` is never used
[INFO] [stdout]  --> src/ast.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub trait Statement: Node {
[INFO] [stdout]   |           ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Expression` is never used
[INFO] [stdout]   --> src/ast.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Expression: Node {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExpressionStatement` is never constructed
[INFO] [stdout]    --> src/ast.rs:183:12
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub struct ExpressionStatement {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "d5f30152e8b865db26a87326f397513c0121c0a23f6b0b18d64491b939049651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5f30152e8b865db26a87326f397513c0121c0a23f6b0b18d64491b939049651", kill_on_drop: false }`
[INFO] [stdout] d5f30152e8b865db26a87326f397513c0121c0a23f6b0b18d64491b939049651