[INFO] fetching crate charcoal-client 0.1.0...
[INFO] checking charcoal-client-0.1.0 against master#9610dfe5a9a731ced1ea4923ecbd0c57fe367898 for beta-170-4
[INFO] extracting crate charcoal-client 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate charcoal-client 0.1.0 on toolchain 9610dfe5a9a731ced1ea4923ecbd0c57fe367898
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9610dfe5a9a731ced1ea4923ecbd0c57fe367898" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate charcoal-client 0.1.0
[INFO] finished tweaking crates.io crate charcoal-client 0.1.0
[INFO] tweaked toml for crates.io crate charcoal-client 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate charcoal-client 0.1.0 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" "+9610dfe5a9a731ced1ea4923ecbd0c57fe367898" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+9610dfe5a9a731ced1ea4923ecbd0c57fe367898" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ee587bc4b753f270639499be00aa63c0bb309c9d793e6951a15471b17d6aae7
[INFO] running `Command { std: "docker" "start" "-a" "6ee587bc4b753f270639499be00aa63c0bb309c9d793e6951a15471b17d6aae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ee587bc4b753f270639499be00aa63c0bb309c9d793e6951a15471b17d6aae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ee587bc4b753f270639499be00aa63c0bb309c9d793e6951a15471b17d6aae7", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+9610dfe5a9a731ced1ea4923ecbd0c57fe367898" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2648077e5b2925ecf1840095678bf29509dcf988e606feaf6ea62e7e95484288
[INFO] running `Command { std: "docker" "start" "-a" "2648077e5b2925ecf1840095678bf29509dcf988e606feaf6ea62e7e95484288", kill_on_drop: false }`
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[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]   --> examples/basic_music_bot.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/basic_music_bot.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/basic_music_bot.rs:209:13
[INFO] [stdout]     |
[INFO] [stdout] 209 |     let mut handler : Option<&mut PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/basic_music_bot.rs:231:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/basic_music_bot.rs:252:13
[INFO] [stdout]     |
[INFO] [stdout] 252 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/basic_music_bot.rs:293:13
[INFO] [stdout]     |
[INFO] [stdout] 293 |     let mut handler : Option<&mut PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:125:13
[INFO] [stdout]     |
[INFO] [stdout] 125 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/basic_music_bot.rs:91:5
[INFO] [stdout]    |
[INFO] [stdout] 91 |     tokio::signal::ctrl_c().await;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let _ = tokio::signal::ctrl_c().await;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:226:13
[INFO] [stdout]     |
[INFO] [stdout] 226 |     let mut handler : Option<&mut PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:248:13
[INFO] [stdout]     |
[INFO] [stdout] 248 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:269:13
[INFO] [stdout]     |
[INFO] [stdout] 269 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:310:13
[INFO] [stdout]     |
[INFO] [stdout] 310 |     let mut handler : Option<&mut PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:346:13
[INFO] [stdout]     |
[INFO] [stdout] 346 |     let mut handler : Option<&mut PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:378:17
[INFO] [stdout]     |
[INFO] [stdout] 378 |         let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:403:13
[INFO] [stdout]     |
[INFO] [stdout] 403 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:435:13
[INFO] [stdout]     |
[INFO] [stdout] 435 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `handler` is never read
[INFO] [stdout]    --> examples/advanced_music_bot.rs:464:13
[INFO] [stdout]     |
[INFO] [stdout] 464 |     let mut handler : Option<&PlayerObject> = None;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> examples/advanced_music_bot.rs:98:5
[INFO] [stdout]    |
[INFO] [stdout] 98 |     tokio::signal::ctrl_c().await;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let _ = tokio::signal::ctrl_c().await;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.77s
[INFO] running `Command { std: "docker" "inspect" "2648077e5b2925ecf1840095678bf29509dcf988e606feaf6ea62e7e95484288", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2648077e5b2925ecf1840095678bf29509dcf988e606feaf6ea62e7e95484288", kill_on_drop: false }`
[INFO] [stdout] 2648077e5b2925ecf1840095678bf29509dcf988e606feaf6ea62e7e95484288
