[INFO] fetching crate polywrap-wasm-rs 0.12.2...
[INFO] building polywrap-wasm-rs-0.12.2 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate polywrap-wasm-rs 0.12.2 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate polywrap-wasm-rs 0.12.2
[INFO] finished tweaking crates.io crate polywrap-wasm-rs 0.12.2
[INFO] tweaked toml for crates.io crate polywrap-wasm-rs 0.12.2 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate polywrap-wasm-rs 0.12.2 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 21 packages to latest compatible versions
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fef4f44fc640809352534b0ba040488efe1703d9733e8c75c5df927af95c3726
[INFO] running `Command { std: "docker" "start" "-a" "fef4f44fc640809352534b0ba040488efe1703d9733e8c75c5df927af95c3726", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fef4f44fc640809352534b0ba040488efe1703d9733e8c75c5df927af95c3726", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fef4f44fc640809352534b0ba040488efe1703d9733e8c75c5df927af95c3726", kill_on_drop: false }`
[INFO] [stdout] fef4f44fc640809352534b0ba040488efe1703d9733e8c75c5df927af95c3726
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b430c5b391a90453c2bb082a7bcd26b8b0dc9fbd1a2b39472c5602d9961155e3
[INFO] running `Command { std: "docker" "start" "-a" "b430c5b391a90453c2bb082a7bcd26b8b0dc9fbd1a2b39472c5602d9961155e3", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling serde_bytes v0.11.19
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling bigdecimal v0.3.1
[INFO] [stderr]    Compiling polywrap_msgpack_serde v0.0.2
[INFO] [stderr]    Compiling polywrap-wasm-rs v0.12.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/msgpack/read_decoder.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 |         mut key_reader: impl FnMut(&mut Self) -> Result<K, DecodeError>,
[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/msgpack/read_decoder.rs:444:9
[INFO] [stdout]     |
[INFO] [stdout] 444 |         mut val_reader: impl FnMut(&mut Self) -> Result<V, DecodeError>,
[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/msgpack/write_encoder.rs:278:9
[INFO] [stdout]     |
[INFO] [stdout] 278 |         mut key_writer: impl FnMut(&mut Self, &K) -> Result<(), EncodeError>,
[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/msgpack/write_encoder.rs:279:9
[INFO] [stdout]     |
[INFO] [stdout] 279 |         mut val_writer: impl FnMut(&mut Self, &V) -> Result<(), EncodeError>,
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.65s
[INFO] running `Command { std: "docker" "inspect" "b430c5b391a90453c2bb082a7bcd26b8b0dc9fbd1a2b39472c5602d9961155e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b430c5b391a90453c2bb082a7bcd26b8b0dc9fbd1a2b39472c5602d9961155e3", kill_on_drop: false }`
[INFO] [stdout] b430c5b391a90453c2bb082a7bcd26b8b0dc9fbd1a2b39472c5602d9961155e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85d07541888ce84f69629b6e3534d8c1bd4644392ac5afc21cdfd895538aa853
[INFO] running `Command { std: "docker" "start" "-a" "85d07541888ce84f69629b6e3534d8c1bd4644392ac5afc21cdfd895538aa853", kill_on_drop: false }`
[INFO] [stderr]    Compiling polywrap-wasm-rs v0.12.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/msgpack/read_decoder.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 |         mut key_reader: impl FnMut(&mut Self) -> Result<K, DecodeError>,
[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/msgpack/read_decoder.rs:444:9
[INFO] [stdout]     |
[INFO] [stdout] 444 |         mut val_reader: impl FnMut(&mut Self) -> Result<V, DecodeError>,
[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/msgpack/write_encoder.rs:278:9
[INFO] [stdout]     |
[INFO] [stdout] 278 |         mut key_writer: impl FnMut(&mut Self, &K) -> Result<(), EncodeError>,
[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/msgpack/write_encoder.rs:279:9
[INFO] [stdout]     |
[INFO] [stdout] 279 |         mut val_writer: impl FnMut(&mut Self, &V) -> Result<(), EncodeError>,
[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/msgpack/write_encoder.rs:278:9
[INFO] [stdout]     |
[INFO] [stdout] 278 |         mut key_writer: impl FnMut(&mut Self, &K) -> Result<(), EncodeError>,
[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/msgpack/write_encoder.rs:279:9
[INFO] [stdout]     |
[INFO] [stdout] 279 |         mut val_writer: impl FnMut(&mut Self, &V) -> Result<(), EncodeError>,
[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/msgpack/read_decoder.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 |         mut key_reader: impl FnMut(&mut Self) -> Result<K, DecodeError>,
[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/msgpack/read_decoder.rs:444:9
[INFO] [stdout]     |
[INFO] [stdout] 444 |         mut val_reader: impl FnMut(&mut Self) -> Result<V, DecodeError>,
[INFO] [stdout]     |         ----^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> tests/test_encode.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Case<T> {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] 7 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Case` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> tests/test_encode.rs:381:9
[INFO] [stdout]     |
[INFO] [stdout] 381 |         writer.write_array(&case.input, |writer, item| writer.write_i32(item));
[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] 381 |         let _ = writer.write_array(&case.input, |writer, item| writer.write_i32(item));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.69s
[INFO] running `Command { std: "docker" "inspect" "85d07541888ce84f69629b6e3534d8c1bd4644392ac5afc21cdfd895538aa853", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85d07541888ce84f69629b6e3534d8c1bd4644392ac5afc21cdfd895538aa853", kill_on_drop: false }`
[INFO] [stdout] 85d07541888ce84f69629b6e3534d8c1bd4644392ac5afc21cdfd895538aa853
