[INFO] fetching crate icentral-test-insertion 0.1.0...
[INFO] checking icentral-test-insertion-0.1.0 against master#3391c0133661be933c3ef24edf1867d71b9f206b for pr-149195-2
[INFO] extracting crate icentral-test-insertion 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate icentral-test-insertion 0.1.0
[INFO] finished tweaking crates.io crate icentral-test-insertion 0.1.0
[INFO] tweaked toml for crates.io crate icentral-test-insertion 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate icentral-test-insertion 0.1.0 on toolchain 3391c0133661be933c3ef24edf1867d71b9f206b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3391c0133661be933c3ef24edf1867d71b9f206b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate icentral-test-insertion 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" "+3391c0133661be933c3ef24edf1867d71b9f206b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded icentral-gen-rand-edges v0.1.0
[INFO] [stderr]   Downloaded icentral-muc-speedup-stats v0.1.0
[INFO] [stderr]   Downloaded icentral-speedup-calculation v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+3391c0133661be933c3ef24edf1867d71b9f206b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] feadcd197de251046a3476d8f844d1d2ebbe026d053507dfd8e0aa42f3c3f2e5
[INFO] running `Command { std: "docker" "start" "-a" "feadcd197de251046a3476d8f844d1d2ebbe026d053507dfd8e0aa42f3c3f2e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "feadcd197de251046a3476d8f844d1d2ebbe026d053507dfd8e0aa42f3c3f2e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "feadcd197de251046a3476d8f844d1d2ebbe026d053507dfd8e0aa42f3c3f2e5", kill_on_drop: false }`
[INFO] [stdout] feadcd197de251046a3476d8f844d1d2ebbe026d053507dfd8e0aa42f3c3f2e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+3391c0133661be933c3ef24edf1867d71b9f206b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 33ebd2c96c1f580529be80db89ae733e67b58c6a6d3650328c108c09824ef0e9
[INFO] running `Command { std: "docker" "start" "-a" "33ebd2c96c1f580529be80db89ae733e67b58c6a6d3650328c108c09824ef0e9", kill_on_drop: false }`
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[INFO] [stderr]     Checking icentral-test-insertion v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `named_item::*`
[INFO] [stdout]   --> src/imports.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub(crate) use named_item::*;
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `named_item::*`
[INFO] [stdout]   --> src/imports.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub(crate) use named_item::*;
[INFO] [stdout]    |                ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_hash.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let scores = brandes_bc_hash(&mut gh, None)?;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/test_insertion_hash.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 0..num_edges_to_insert {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `brandes_time` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:15:28
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut brandes_time = Duration::from_secs(0);
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `src` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:45:31
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let mut src: NodeId = NodeId::default();
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `dst` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let mut dst: NodeId = NodeId::default();
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_hash.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let scores = brandes_bc_hash(&mut gh, None)?;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/test_insertion_hash.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 0..num_edges_to_insert {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `brandes_time` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:15:28
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut brandes_time = Duration::from_secs(0);
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `src` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:45:31
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let mut src: NodeId = NodeId::default();
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `dst` is never read
[INFO] [stdout]   --> src/test_insertion_hash.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let mut dst: NodeId = NodeId::default();
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let scores: BetweennessScores = brandes_bc_hash_out(
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:74:13
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let scores: BetweennessScores = brandes_bc_hash_out(
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `brandes_time` is never read
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:47:28
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let mut brandes_time = Duration::from_secs(0);
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `ideal_speedup_perfect` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:198:46
[INFO] [stdout]     |
[INFO] [stdout] 198 |         let mut ideal_speedup_perfect: f64 = 0.0;
[INFO] [stdout]     |                                              ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `ideal_speedup` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:199:46
[INFO] [stdout]     |
[INFO] [stdout] 199 |         let mut ideal_speedup:         f64 = 0.0;
[INFO] [stdout]     |                                              ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `in_mem_speedup` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:236:39
[INFO] [stdout]     |
[INFO] [stdout] 236 |         let mut in_mem_speedup: f64 = 0.0;
[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]   --> src/test_insertion_hash.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 | /         graph.insert_edge_update_bc_experimental(
[INFO] [stdout] 87 | |             &rand_edge, 
[INFO] [stdout] 88 | |             &mut bcc_stat,
[INFO] [stdout] 89 | |             None,
[INFO] [stdout] 90 | |             None,
[INFO] [stdout] 91 | |         );
[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] 86 |         let _ = graph.insert_edge_update_bc_experimental(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_hash.rs:97:9
[INFO] [stdout]     |
[INFO] [stdout]  97 | /         graph.approx_bcc_iter_tm(
[INFO] [stdout]  98 | |             rand_edge.src, 
[INFO] [stdout]  99 | |             rand_edge.dst, 
[INFO] [stdout] 100 | |             &mut avg_iter_time_naive,
[INFO] [stdout] 101 | |             None,
[INFO] [stdout] 102 | |         );
[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]  97 |         let _ = graph.approx_bcc_iter_tm(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 | /         graph.insert_edge_update_bc_experimental(
[INFO] [stdout] 136 | |             &rand_edge, 
[INFO] [stdout] 137 | |             &mut bcc_stat, 
[INFO] [stdout] 138 | |             Some(num_iter), 
[INFO] [stdout] 139 | |             Some(num_iter)
[INFO] [stdout] 140 | |         );
[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] 135 |         let _ = graph.insert_edge_update_bc_experimental(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 | /         graph.approx_bcc_iter_tm(
[INFO] [stdout] 155 | |             rand_edge.src, 
[INFO] [stdout] 156 | |             rand_edge.dst, 
[INFO] [stdout] 157 | |             &mut avg_iter_time_naive, 
[INFO] [stdout] 158 | |             Some(num_iter)
[INFO] [stdout] 159 | |         );
[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] 154 |         let _ = graph.approx_bcc_iter_tm(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let scores: BetweennessScores = brandes_bc_hash_out(
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:74:13
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let scores: BetweennessScores = brandes_bc_hash_out(
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `brandes_time` is never read
[INFO] [stdout]   --> src/test_insertion_max_iter.rs:47:28
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let mut brandes_time = Duration::from_secs(0);
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `ideal_speedup_perfect` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:198:46
[INFO] [stdout]     |
[INFO] [stdout] 198 |         let mut ideal_speedup_perfect: f64 = 0.0;
[INFO] [stdout]     |                                              ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `ideal_speedup` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:199:46
[INFO] [stdout]     |
[INFO] [stdout] 199 |         let mut ideal_speedup:         f64 = 0.0;
[INFO] [stdout]     |                                              ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `in_mem_speedup` is never read
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:236:39
[INFO] [stdout]     |
[INFO] [stdout] 236 |         let mut in_mem_speedup: f64 = 0.0;
[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]   --> src/test_insertion_hash.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 | /         graph.insert_edge_update_bc_experimental(
[INFO] [stdout] 87 | |             &rand_edge, 
[INFO] [stdout] 88 | |             &mut bcc_stat,
[INFO] [stdout] 89 | |             None,
[INFO] [stdout] 90 | |             None,
[INFO] [stdout] 91 | |         );
[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] 86 |         let _ = graph.insert_edge_update_bc_experimental(
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_hash.rs:97:9
[INFO] [stdout]     |
[INFO] [stdout]  97 | /         graph.approx_bcc_iter_tm(
[INFO] [stdout]  98 | |             rand_edge.src, 
[INFO] [stdout]  99 | |             rand_edge.dst, 
[INFO] [stdout] 100 | |             &mut avg_iter_time_naive,
[INFO] [stdout] 101 | |             None,
[INFO] [stdout] 102 | |         );
[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]  97 |         let _ = graph.approx_bcc_iter_tm(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 | /         graph.insert_edge_update_bc_experimental(
[INFO] [stdout] 136 | |             &rand_edge, 
[INFO] [stdout] 137 | |             &mut bcc_stat, 
[INFO] [stdout] 138 | |             Some(num_iter), 
[INFO] [stdout] 139 | |             Some(num_iter)
[INFO] [stdout] 140 | |         );
[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] 135 |         let _ = graph.insert_edge_update_bc_experimental(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/test_insertion_max_iter.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 | /         graph.approx_bcc_iter_tm(
[INFO] [stdout] 155 | |             rand_edge.src, 
[INFO] [stdout] 156 | |             rand_edge.dst, 
[INFO] [stdout] 157 | |             &mut avg_iter_time_naive, 
[INFO] [stdout] 158 | |             Some(num_iter)
[INFO] [stdout] 159 | |         );
[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] 154 |         let _ = graph.approx_bcc_iter_tm(
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.17s
[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 3`
[INFO] running `Command { std: "docker" "inspect" "33ebd2c96c1f580529be80db89ae733e67b58c6a6d3650328c108c09824ef0e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33ebd2c96c1f580529be80db89ae733e67b58c6a6d3650328c108c09824ef0e9", kill_on_drop: false }`
[INFO] [stdout] 33ebd2c96c1f580529be80db89ae733e67b58c6a6d3650328c108c09824ef0e9
