[INFO] fetching crate tcb 0.1.202...
[INFO] checking tcb-0.1.202 against master#5518eaa946291f00471af8b254b2a1715f234882 for pr-120393-1
[INFO] extracting crate tcb 0.1.202 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate tcb 0.1.202 on toolchain 5518eaa946291f00471af8b254b2a1715f234882
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tcb 0.1.202
[INFO] finished tweaking crates.io crate tcb 0.1.202
[INFO] tweaked toml for crates.io crate tcb 0.1.202 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate tcb 0.1.202 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" "+5518eaa946291f00471af8b254b2a1715f234882" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.1
[INFO] [stderr]   Downloaded memoffset v0.5.4
[INFO] [stderr]   Downloaded fixedbitset v0.2.0
[INFO] [stderr]   Downloaded bit-vec v0.6.2
[INFO] [stderr]   Downloaded serde_derive v1.0.110
[INFO] [stderr]   Downloaded serde v1.0.110
[INFO] [stderr]   Downloaded petgraph v0.5.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9da0700b29f46e6c353effbf1255c34edc6d4434d51270601da524d2207eb827
[INFO] running `Command { std: "docker" "start" "-a" "9da0700b29f46e6c353effbf1255c34edc6d4434d51270601da524d2207eb827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9da0700b29f46e6c353effbf1255c34edc6d4434d51270601da524d2207eb827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9da0700b29f46e6c353effbf1255c34edc6d4434d51270601da524d2207eb827", kill_on_drop: false }`
[INFO] [stdout] 9da0700b29f46e6c353effbf1255c34edc6d4434d51270601da524d2207eb827
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a23a08a0feab1a291c5013f8f169632041c9e0869e2b7895e8f22b43537ca39
[INFO] running `Command { std: "docker" "start" "-a" "0a23a08a0feab1a291c5013f8f169632041c9e0869e2b7895e8f22b43537ca39", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling syn v1.0.19
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking fixedbitset v0.2.0
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]     Checking petgraph v0.5.1
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]     Checking tcb v0.1.202 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/causality_checker/causality_checker.rs:577:13
[INFO] [stdout]     |
[INFO] [stdout] 577 |             drop(pred_dot);
[INFO] [stdout]     |             ^^^^^--------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut causality_checker_structs::CheckNode`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:200:21
[INFO] [stdout]     |
[INFO] [stdout] 200 |                     drop(pred_temp_node);
[INFO] [stdout]     |                     ^^^^^--------------^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         drop(delivered_node);
[INFO] [stdout]     |         ^^^^^--------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:349:9
[INFO] [stdout]     |
[INFO] [stdout] 349 |         drop(stable_node);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/vv/middleware/version_vector.rs:285:24
[INFO] [stdout]     |
[INFO] [stdout] 285 |                 panic!(error_message);
[INFO] [stdout]     |                        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]     |
[INFO] [stdout] 285 |                 panic!("{}", error_message);
[INFO] [stdout]     |                        +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blocking_delivery`
[INFO] [stdout]   --> examples/vv_client.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let blocking_delivery = vv.recv()?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_blocking_delivery`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_blocking_delivery`
[INFO] [stdout]   --> examples/vv_client.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let non_blocking_delivery = vv.try_recv()?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_blocking_delivery`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `timeout_delivery`
[INFO] [stdout]   --> examples/vv_client.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let timeout_delivery = vv.recv_timeout(Duration::from_secs(1))?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_timeout_delivery`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/causality_checker/causality_checker.rs:577:13
[INFO] [stdout]     |
[INFO] [stdout] 577 |             drop(pred_dot);
[INFO] [stdout]     |             ^^^^^--------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut causality_checker_structs::CheckNode`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:200:21
[INFO] [stdout]     |
[INFO] [stdout] 200 |                     drop(pred_temp_node);
[INFO] [stdout]     |                     ^^^^^--------------^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sent_message_context`
[INFO] [stdout]   --> examples/graph_client.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let sent_message_context = graph.send(serialized_message);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sent_message_context`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_blocking_delivery`
[INFO] [stdout]   --> examples/graph_client.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let non_blocking_delivery = graph.try_recv()?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_blocking_delivery`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `timeout_delivery`
[INFO] [stdout]   --> examples/graph_client.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let timeout_delivery = graph.recv_timeout(Duration::from_secs(1))?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_timeout_delivery`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         drop(delivered_node);
[INFO] [stdout]     |         ^^^^^--------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/graph/middleware/graph.rs:349:9
[INFO] [stdout]     |
[INFO] [stdout] 349 |         drop(stable_node);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut node::Node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/vv/middleware/version_vector.rs:285:24
[INFO] [stdout]     |
[INFO] [stdout] 285 |                 panic!(error_message);
[INFO] [stdout]     |                        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]     |
[INFO] [stdout] 285 |                 panic!("{}", error_message);
[INFO] [stdout]     |                        +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.73s
[INFO] running `Command { std: "docker" "inspect" "0a23a08a0feab1a291c5013f8f169632041c9e0869e2b7895e8f22b43537ca39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a23a08a0feab1a291c5013f8f169632041c9e0869e2b7895e8f22b43537ca39", kill_on_drop: false }`
[INFO] [stdout] 0a23a08a0feab1a291c5013f8f169632041c9e0869e2b7895e8f22b43537ca39
