[INFO] fetching crate simple_trie 0.1.22...
[INFO] checking simple_trie-0.1.22 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate simple_trie 0.1.22 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate simple_trie 0.1.22 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple_trie 0.1.22
[INFO] finished tweaking crates.io crate simple_trie 0.1.22
[INFO] tweaked toml for crates.io crate simple_trie 0.1.22 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 538e5f756a1106953180272a0003a34f19d7c4e3c90777e4de0e1d3ec60daf8f
[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" "538e5f756a1106953180272a0003a34f19d7c4e3c90777e4de0e1d3ec60daf8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "538e5f756a1106953180272a0003a34f19d7c4e3c90777e4de0e1d3ec60daf8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "538e5f756a1106953180272a0003a34f19d7c4e3c90777e4de0e1d3ec60daf8f", kill_on_drop: false }`
[INFO] [stdout] 538e5f756a1106953180272a0003a34f19d7c4e3c90777e4de0e1d3ec60daf8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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] 35ef949833cfc61380357b554b65defe33771cc18e55d7e1302fd96c6d70345c
[INFO] running `Command { std: "docker" "start" "-a" "35ef949833cfc61380357b554b65defe33771cc18e55d7e1302fd96c6d70345c", kill_on_drop: false }`
[INFO] [stderr]     Checking simple_trie v0.1.22 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Write`, `stdin`, `stdout`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     io::{prelude::*, BufReader,stdin,stdout,Write
[INFO] [stdout]   |                                ^^^^^ ^^^^^^ ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `stdin`, `stdout`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     io::{prelude::*, BufReader,stdin,stdout,Write
[INFO] [stdout]   |                                ^^^^^ ^^^^^^ ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `key` is never read
[INFO] [stdout]    --> src/lib.rs:169:11
[INFO] [stdout]     |
[INFO] [stdout] 169 |         let mut key = "".to_string();
[INFO] [stdout]     |                 ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut value: u32 = 0;
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:170:7
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut value: u32 = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `key` is never read
[INFO] [stdout]    --> src/lib.rs:169:11
[INFO] [stdout]     |
[INFO] [stdout] 169 |         let mut key = "".to_string();
[INFO] [stdout]     |                 ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut value: u32 = 0;
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:170:7
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut value: u32 = 0;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "35ef949833cfc61380357b554b65defe33771cc18e55d7e1302fd96c6d70345c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35ef949833cfc61380357b554b65defe33771cc18e55d7e1302fd96c6d70345c", kill_on_drop: false }`
[INFO] [stdout] 35ef949833cfc61380357b554b65defe33771cc18e55d7e1302fd96c6d70345c