[INFO] fetching crate walle_mqtt_protocol 0.1.14...
[INFO] checking walle_mqtt_protocol-0.1.14 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate walle_mqtt_protocol 0.1.14 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate walle_mqtt_protocol 0.1.14 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 walle_mqtt_protocol 0.1.14
[INFO] finished tweaking crates.io crate walle_mqtt_protocol 0.1.14
[INFO] tweaked toml for crates.io crate walle_mqtt_protocol 0.1.14 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 15 packages to latest compatible versions
[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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] b35db8b1d1f846646b01794e4da3b8f88b2abbe590f76c678251479eecd6c822
[INFO] running `Command { std: "docker" "start" "-a" "b35db8b1d1f846646b01794e4da3b8f88b2abbe590f76c678251479eecd6c822", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b35db8b1d1f846646b01794e4da3b8f88b2abbe590f76c678251479eecd6c822", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b35db8b1d1f846646b01794e4da3b8f88b2abbe590f76c678251479eecd6c822", kill_on_drop: false }`
[INFO] [stdout] b35db8b1d1f846646b01794e4da3b8f88b2abbe590f76c678251479eecd6c822
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] e9f70fe4f454047f87d4a833602208835d7cbb143959c37744ccc7a2a5db9380
[INFO] running `Command { std: "docker" "start" "-a" "e9f70fe4f454047f87d4a833602208835d7cbb143959c37744ccc7a2a5db9380", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling thiserror-impl v1.0.64
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]    Compiling serde_derive v1.0.210
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking thiserror v1.0.64
[INFO] [stderr]     Checking serde v1.0.210
[INFO] [stderr]     Checking walle_mqtt_protocol v0.1.14 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `connect_flags` is never read
[INFO] [stdout]    --> src/v4/connect.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |             connect_flags |= login.write(buffer);
[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 `connect_flags` is never read
[INFO] [stdout]    --> src/v4/connect.rs:112:13
[INFO] [stdout]     |
[INFO] [stdout] 112 |             connect_flags |= login.write(buffer);
[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 `byte1` is never read
[INFO] [stdout]    --> src/v4/fixed_header.rs:206:13
[INFO] [stdout]     |
[INFO] [stdout] 206 |     let mut byte1: u8 = 0b0000_0000;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `resp` is never read
[INFO] [stdout]    --> src/v4/fixed_header.rs:522:13
[INFO] [stdout]     |
[INFO] [stdout] 522 |     let mut resp: usize = 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 `byte1` is never read
[INFO] [stdout]    --> src/v4/fixed_header.rs:206:13
[INFO] [stdout]     |
[INFO] [stdout] 206 |     let mut byte1: u8 = 0b0000_0000;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `resp` is never read
[INFO] [stdout]    --> src/v4/fixed_header.rs:522:13
[INFO] [stdout]     |
[INFO] [stdout] 522 |     let mut resp: usize = 0;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `qos` is never read
[INFO] [stdout]    --> src/v4/builder.rs:538:5
[INFO] [stdout]     |
[INFO] [stdout] 537 | pub struct SubAckBuilder {
[INFO] [stdout]     |            ------------- field in this struct
[INFO] [stdout] 538 |     qos: QoS,
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_ack.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct PubAck {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 22 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubAck` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_comp.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct PubComp {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 20 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubComp` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_rec.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct PubRec {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 20 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubRec` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_rel.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct PubRel {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 18 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubRel` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `qos` is never read
[INFO] [stdout]    --> src/v4/builder.rs:538:5
[INFO] [stdout]     |
[INFO] [stdout] 537 | pub struct SubAckBuilder {
[INFO] [stdout]     |            ------------- field in this struct
[INFO] [stdout] 538 |     qos: QoS,
[INFO] [stdout]     |     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_fixed_header` is never used
[INFO] [stdout]    --> src/v4/connect.rs:454:8
[INFO] [stdout]     |
[INFO] [stdout] 454 |     fn build_fixed_header() -> Option<FixedHeader> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_connect_variable_header` is never used
[INFO] [stdout]    --> src/v4/connect.rs:468:8
[INFO] [stdout]     |
[INFO] [stdout] 468 |     fn build_connect_variable_header() -> Option<ConnectVariableHeader> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_ack.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct PubAck {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 22 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubAck` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_comp.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct PubComp {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 20 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubComp` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_rec.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct PubRec {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 20 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubRec` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fixed_header` is never read
[INFO] [stdout]   --> src/v4/pub_rel.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct PubRel {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 18 |     fixed_header: FixedHeader,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PubRel` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.90s
[INFO] running `Command { std: "docker" "inspect" "e9f70fe4f454047f87d4a833602208835d7cbb143959c37744ccc7a2a5db9380", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9f70fe4f454047f87d4a833602208835d7cbb143959c37744ccc7a2a5db9380", kill_on_drop: false }`
[INFO] [stdout] e9f70fe4f454047f87d4a833602208835d7cbb143959c37744ccc7a2a5db9380