[INFO] fetching crate plotlib 0.5.1...
[INFO] checking plotlib-0.5.1 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate plotlib 0.5.1 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate plotlib 0.5.1 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate plotlib 0.5.1
[INFO] finished tweaking crates.io crate plotlib 0.5.1
[INFO] tweaked toml for crates.io crate plotlib 0.5.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate crates.io crate plotlib 0.5.1 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2a812aa43d289e2c450023e1231c1832711b61fcda0e0d0d8a46b3a33a40320
[INFO] running `Command { std: "docker" "start" "-a" "f2a812aa43d289e2c450023e1231c1832711b61fcda0e0d0d8a46b3a33a40320", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2a812aa43d289e2c450023e1231c1832711b61fcda0e0d0d8a46b3a33a40320", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2a812aa43d289e2c450023e1231c1832711b61fcda0e0d0d8a46b3a33a40320", kill_on_drop: false }`
[INFO] [stdout] f2a812aa43d289e2c450023e1231c1832711b61fcda0e0d0d8a46b3a33a40320
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dtail_expr_drop_order" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 47b18fe906ea53da9b64cfad9f18c3edbc907cbcfbbf1fd0d6bbef2fcd7dabf4
[INFO] running `Command { std: "docker" "start" "-a" "47b18fe906ea53da9b64cfad9f18c3edbc907cbcfbbf1fd0d6bbef2fcd7dabf4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking svg v0.7.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.34
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking backtrace v0.3.45
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking plotlib v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/utils.rs:23:47
[INFO] [stdout]    |
[INFO] [stdout] 23 |         0 => (s[(s.len() / 2) - 1] / 2.) + (s[(s.len() / 2)] / 2.),
[INFO] [stdout]    |                                               ^           ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -         0 => (s[(s.len() / 2) - 1] / 2.) + (s[(s.len() / 2)] / 2.),
[INFO] [stdout] 23 +         0 => (s[(s.len() / 2) - 1] / 2.) + (s[s.len() / 2] / 2.),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/utils.rs:23:47
[INFO] [stdout]    |
[INFO] [stdout] 23 |         0 => (s[(s.len() / 2) - 1] / 2.) + (s[(s.len() / 2)] / 2.),
[INFO] [stdout]    |                                               ^           ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -         0 => (s[(s.len() / 2) - 1] / 2.) + (s[(s.len() / 2)] / 2.),
[INFO] [stdout] 23 +         0 => (s[(s.len() / 2) - 1] / 2.) + (s[s.len() / 2] / 2.),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line_style`
[INFO] [stdout]    --> src/repr/plot.rs:182:38
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let face_lines = if let Some(line_style) = &self.line_style {
[INFO] [stdout]     |                                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_line_style`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line_style`
[INFO] [stdout]    --> src/repr/plot.rs:182:38
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let face_lines = if let Some(line_style) = &self.line_style {
[INFO] [stdout]     |                                      ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_line_style`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.74s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: svg v0.7.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "47b18fe906ea53da9b64cfad9f18c3edbc907cbcfbbf1fd0d6bbef2fcd7dabf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47b18fe906ea53da9b64cfad9f18c3edbc907cbcfbbf1fd0d6bbef2fcd7dabf4", kill_on_drop: false }`
[INFO] [stdout] 47b18fe906ea53da9b64cfad9f18c3edbc907cbcfbbf1fd0d6bbef2fcd7dabf4