[INFO] fetching crate icentral-bcc 0.1.0...
[INFO] checking icentral-bcc-0.1.0 against try#0bdee9e879c87b7211d316e9152109cfd46c576b for pr-150097
[INFO] extracting crate icentral-bcc 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate icentral-bcc 0.1.0
[INFO] finished tweaking crates.io crate icentral-bcc 0.1.0
[INFO] tweaked toml for crates.io crate icentral-bcc 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate icentral-bcc 0.1.0 on toolchain 0bdee9e879c87b7211d316e9152109cfd46c576b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0bdee9e879c87b7211d316e9152109cfd46c576b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate icentral-bcc 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" "+0bdee9e879c87b7211d316e9152109cfd46c576b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0bdee9e879c87b7211d316e9152109cfd46c576b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77485dc48b3e6ecd2bfd1d969998a3ecb1b6c31f03cb0f1c2582b2eed1f0636a
[INFO] running `Command { std: "docker" "start" "-a" "77485dc48b3e6ecd2bfd1d969998a3ecb1b6c31f03cb0f1c2582b2eed1f0636a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77485dc48b3e6ecd2bfd1d969998a3ecb1b6c31f03cb0f1c2582b2eed1f0636a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77485dc48b3e6ecd2bfd1d969998a3ecb1b6c31f03cb0f1c2582b2eed1f0636a", kill_on_drop: false }`
[INFO] [stdout] 77485dc48b3e6ecd2bfd1d969998a3ecb1b6c31f03cb0f1c2582b2eed1f0636a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0bdee9e879c87b7211d316e9152109cfd46c576b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d948f00d83ee6c65f3e575ac2ecbca75ce2cacce09b3ba67acdd24c4febd864
[INFO] running `Command { std: "docker" "start" "-a" "4d948f00d83ee6c65f3e575ac2ecbca75ce2cacce09b3ba67acdd24c4febd864", kill_on_drop: false }`
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[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:84:40
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let last_edge = Edge::new(u,v);;
[INFO] [stdout]    |                                        ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:84:40
[INFO] [stdout]    |
[INFO] [stdout] 84 |         let last_edge = Edge::new(u,v);;
[INFO] [stdout]    |                                        ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let mut e: Edge = Edge::default();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let mut e: Edge = Edge::default();
[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: `edge`
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:88:24
[INFO] [stdout]    |
[INFO] [stdout] 88 |         while let Some(edge) = ctx.edge_stack.pop() {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_edge`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `edge`
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:88:24
[INFO] [stdout]    |
[INFO] [stdout] 88 |         while let Some(edge) = ctx.edge_stack.pop() {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_edge`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/find_biconnected_component.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let mut u: NodeId = NodeId::zero();
[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/find_biconnected_component.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let mut u: NodeId = NodeId::zero();
[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/find_edge_bcc_subgraph.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut u: NodeId = NodeId::default();
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut u: NodeId = NodeId::default();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut u: NodeId = NodeId::default();
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut u: NodeId = NodeId::default();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bcc_dfs_visitor.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     bcc_dfs_visitor(graph, v, ctx, bcc_vec);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let _ = bcc_dfs_visitor(graph, v, ctx, bcc_vec);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bcc_dfs_visitor.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |             bcc.insert_edge(&e);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 99 |             let _ = bcc.insert_edge(&e);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bcc_dfs_visitor.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     bcc_dfs_visitor(graph, v, ctx, bcc_vec);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let _ = bcc_dfs_visitor(graph, v, ctx, bcc_vec);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     edge_bcc_dfs_visitor(graph, v, ctx);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let _ = edge_bcc_dfs_visitor(graph, v, ctx);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bcc_dfs_visitor.rs:99:13
[INFO] [stdout]    |
[INFO] [stdout] 99 |             bcc.insert_edge(&e);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 99 |             let _ = bcc.insert_edge(&e);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_biconnected_component.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 | /         bcc_dfs_visitor(
[INFO] [stdout] 44 | |             self,
[INFO] [stdout] 45 | |             u, 
[INFO] [stdout] 46 | |             &mut ctx,
[INFO] [stdout] 47 | |             out_vec
[INFO] [stdout] 48 | |         );
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let _ = bcc_dfs_visitor(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/edge_bcc_dfs_visitor.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     edge_bcc_dfs_visitor(graph, v, ctx);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let _ = edge_bcc_dfs_visitor(graph, v, ctx);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 | /         edge_bcc_dfs_visitor(
[INFO] [stdout] 75 | |             self,
[INFO] [stdout] 76 | |             edge.src, 
[INFO] [stdout] 77 | |             &mut ctx,
[INFO] [stdout] 78 | |         );
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let _ = edge_bcc_dfs_visitor(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 81 |             bcc.insert_edge(&e);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 81 |             let _ = bcc.insert_edge(&e);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_biconnected_component.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 | /         bcc_dfs_visitor(
[INFO] [stdout] 44 | |             self,
[INFO] [stdout] 45 | |             u, 
[INFO] [stdout] 46 | |             &mut ctx,
[INFO] [stdout] 47 | |             out_vec
[INFO] [stdout] 48 | |         );
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let _ = bcc_dfs_visitor(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 | /         edge_bcc_dfs_visitor(
[INFO] [stdout] 75 | |             self,
[INFO] [stdout] 76 | |             edge.src, 
[INFO] [stdout] 77 | |             &mut ctx,
[INFO] [stdout] 78 | |         );
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let _ = edge_bcc_dfs_visitor(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/find_edge_bcc_subgraph.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 81 |             bcc.insert_edge(&e);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 81 |             let _ = bcc.insert_edge(&e);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 57.78s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: icentral-neighbors v0.1.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 5`
[INFO] running `Command { std: "docker" "inspect" "4d948f00d83ee6c65f3e575ac2ecbca75ce2cacce09b3ba67acdd24c4febd864", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d948f00d83ee6c65f3e575ac2ecbca75ce2cacce09b3ba67acdd24c4febd864", kill_on_drop: false }`
[INFO] [stdout] 4d948f00d83ee6c65f3e575ac2ecbca75ce2cacce09b3ba67acdd24c4febd864
