[INFO] fetching crate indexed_string 0.1.0...
[INFO] checking indexed_string-0.1.0 against master#8c32e313cccf7df531e2d49ffb8227bb92304aee for pr-145608-1
[INFO] extracting crate indexed_string 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate indexed_string 0.1.0
[INFO] finished tweaking crates.io crate indexed_string 0.1.0
[INFO] tweaked toml for crates.io crate indexed_string 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate indexed_string 0.1.0 on toolchain 8c32e313cccf7df531e2d49ffb8227bb92304aee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 00a14beb48dbb8e867fa1a8f847b9d5046bd7bbb4b00f4cb8b9bd2d679c49e7b
[INFO] running `Command { std: "docker" "start" "-a" "00a14beb48dbb8e867fa1a8f847b9d5046bd7bbb4b00f4cb8b9bd2d679c49e7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00a14beb48dbb8e867fa1a8f847b9d5046bd7bbb4b00f4cb8b9bd2d679c49e7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00a14beb48dbb8e867fa1a8f847b9d5046bd7bbb4b00f4cb8b9bd2d679c49e7b", kill_on_drop: false }`
[INFO] [stdout] 00a14beb48dbb8e867fa1a8f847b9d5046bd7bbb4b00f4cb8b9bd2d679c49e7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cb3c08942e241075e8960a32567db381a4e69ba64b270ede98955ca5879acc28
[INFO] running `Command { std: "docker" "start" "-a" "cb3c08942e241075e8960a32567db381a4e69ba64b270ede98955ca5879acc28", kill_on_drop: false }`
[INFO] [stderr]     Checking indexed_string v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |         let mut character_len: u8;
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut extra_variation_selector: Option<[u8; 3]>;
[INFO] [stdout]     |             ----^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:173:13
[INFO] [stdout]     |
[INFO] [stdout] 173 |         let mut raw_len: u8;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `utf8_char` is never used
[INFO] [stdout]   --> src/indexing.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl StringIndex {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn utf8_char(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `string` is never used
[INFO] [stdout]   --> src/indexed_string.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl IndexedString {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 19 |     fn string(&self) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:171:13
[INFO] [stdout]     |
[INFO] [stdout] 171 |         let mut character_len: u8;
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut extra_variation_selector: Option<[u8; 3]>;
[INFO] [stdout]     |             ----^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/indexing.rs:173:13
[INFO] [stdout]     |
[INFO] [stdout] 173 |         let mut raw_len: u8;
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `string` is never used
[INFO] [stdout]   --> src/indexed_string.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl IndexedString {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 19 |     fn string(&self) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "cb3c08942e241075e8960a32567db381a4e69ba64b270ede98955ca5879acc28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb3c08942e241075e8960a32567db381a4e69ba64b270ede98955ca5879acc28", kill_on_drop: false }`
[INFO] [stdout] cb3c08942e241075e8960a32567db381a4e69ba64b270ede98955ca5879acc28