[INFO] cloning repository https://github.com/nikita0607/BrainFuck
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nikita0607/BrainFuck" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikita0607%2FBrainFuck", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikita0607%2FBrainFuck'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef6f47342aae229b5262f511c3cb133c2ff86af2
[INFO] checking nikita0607/BrainFuck against master#642c19bfc3a5c1de985bf5d0cc8207ac9d22708a for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikita0607%2FBrainFuck" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nikita0607/BrainFuck
[INFO] finished tweaking git repo https://github.com/nikita0607/BrainFuck
[INFO] tweaked toml for git repo https://github.com/nikita0607/BrainFuck written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nikita0607/BrainFuck on toolchain 642c19bfc3a5c1de985bf5d0cc8207ac9d22708a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nikita0607/BrainFuck 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" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded utf8parse v0.2.0
[INFO] [stderr]   Downloaded strfmt v0.1.6
[INFO] [stderr]   Downloaded fd-lock v3.0.0
[INFO] [stderr]   Downloaded rustyline v9.0.0
[INFO] [stderr]   Downloaded libc v0.2.106
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5d8ddc0ed662c2dbdaf0acfe4c21ae543e517001c0f3c7d9aff89aac4e287011
[INFO] running `Command { std: "docker" "start" "-a" "5d8ddc0ed662c2dbdaf0acfe4c21ae543e517001c0f3c7d9aff89aac4e287011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d8ddc0ed662c2dbdaf0acfe4c21ae543e517001c0f3c7d9aff89aac4e287011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d8ddc0ed662c2dbdaf0acfe4c21ae543e517001c0f3c7d9aff89aac4e287011", kill_on_drop: false }`
[INFO] [stdout] 5d8ddc0ed662c2dbdaf0acfe4c21ae543e517001c0f3c7d9aff89aac4e287011
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22f00fbefc4e2278fcb0c5dab9908fc6a9c1427805fa4521458677e944888c8c
[INFO] running `Command { std: "docker" "start" "-a" "22f00fbefc4e2278fcb0c5dab9908fc6a9c1427805fa4521458677e944888c8c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking unicode-segmentation v1.8.0
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]     Checking strfmt v0.1.6
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]     Checking nibble_vec v0.1.0
[INFO] [stderr]     Checking radix_trie v0.2.1
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking nix v0.22.2
[INFO] [stderr]     Checking fd-lock v3.0.0
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]     Checking rustyline v9.0.0
[INFO] [stderr]     Checking BrainFuck v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:517:9
[INFO] [stdout]     |
[INFO] [stdout] 517 |     for i in 0..3 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string_id` is never read
[INFO] [stdout]    --> src/main.rs:496:32
[INFO] [stdout]     |
[INFO] [stdout] 496 |     let mut string_id: usize = 0;
[INFO] [stdout]     |                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sym_id` is never read
[INFO] [stdout]    --> src/main.rs:497:29
[INFO] [stdout]     |
[INFO] [stdout] 497 |     let mut sym_id: usize = 0;
[INFO] [stdout]     |                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:532:9
[INFO] [stdout]     |
[INFO] [stdout] 532 |     let mut last_lines: Vec<String> = vec![];
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `last_lines`
[INFO] [stdout]    --> src/main.rs:532:9
[INFO] [stdout]     |
[INFO] [stdout] 532 |     let mut last_lines: Vec<String> = vec![];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_last_lines`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:122:10
[INFO] [stdout]     |
[INFO] [stdout] 122 |     Main(usize)
[INFO] [stdout]     |     ---- ^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 122 -     Main(usize)
[INFO] [stdout] 122 +     Main(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:193:10
[INFO] [stdout]     |
[INFO] [stdout] 193 |     Prev(i32),
[INFO] [stdout]     |     ---- ^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` 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] 193 -     Prev(i32),
[INFO] [stdout] 193 +     Prev(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Str` is never constructed
[INFO] [stdout]    --> src/main.rs:196:5
[INFO] [stdout]     |
[INFO] [stdout] 189 | enum Token {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 196 |     Str(Box<str>),
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Lang` should have a snake case name
[INFO] [stdout]    --> src/main.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 | pub mod Lang {
[INFO] [stdout]     |         ^^^^ help: convert the identifier to snake case: `lang`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:517:9
[INFO] [stdout]     |
[INFO] [stdout] 517 |     for i in 0..3 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string_id` is never read
[INFO] [stdout]    --> src/main.rs:496:32
[INFO] [stdout]     |
[INFO] [stdout] 496 |     let mut string_id: usize = 0;
[INFO] [stdout]     |                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sym_id` is never read
[INFO] [stdout]    --> src/main.rs:497:29
[INFO] [stdout]     |
[INFO] [stdout] 497 |     let mut sym_id: usize = 0;
[INFO] [stdout]     |                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:532:9
[INFO] [stdout]     |
[INFO] [stdout] 532 |     let mut last_lines: Vec<String> = vec![];
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `last_lines`
[INFO] [stdout]    --> src/main.rs:532:9
[INFO] [stdout]     |
[INFO] [stdout] 532 |     let mut last_lines: Vec<String> = vec![];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_last_lines`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:122:10
[INFO] [stdout]     |
[INFO] [stdout] 122 |     Main(usize)
[INFO] [stdout]     |     ---- ^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 122 -     Main(usize)
[INFO] [stdout] 122 +     Main(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:193:10
[INFO] [stdout]     |
[INFO] [stdout] 193 |     Prev(i32),
[INFO] [stdout]     |     ---- ^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` 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] 193 -     Prev(i32),
[INFO] [stdout] 193 +     Prev(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Str` is never constructed
[INFO] [stdout]    --> src/main.rs:196:5
[INFO] [stdout]     |
[INFO] [stdout] 189 | enum Token {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 196 |     Str(Box<str>),
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Lang` should have a snake case name
[INFO] [stdout]    --> src/main.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 | pub mod Lang {
[INFO] [stdout]     |         ^^^^ help: convert the identifier to snake case: `lang`
[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 5.84s
[INFO] running `Command { std: "docker" "inspect" "22f00fbefc4e2278fcb0c5dab9908fc6a9c1427805fa4521458677e944888c8c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22f00fbefc4e2278fcb0c5dab9908fc6a9c1427805fa4521458677e944888c8c", kill_on_drop: false }`
[INFO] [stdout] 22f00fbefc4e2278fcb0c5dab9908fc6a9c1427805fa4521458677e944888c8c
