[INFO] fetching crate urpc 0.2.0...
[INFO] checking urpc-0.2.0 against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] extracting crate urpc 0.2.0 into /workspace/builds/worker-66/source
[INFO] validating manifest of crates.io crate urpc 0.2.0 on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate urpc 0.2.0
[INFO] finished tweaking crates.io crate urpc 0.2.0
[INFO] tweaked toml for crates.io crate urpc 0.2.0 written to /workspace/builds/worker-66/source/Cargo.toml
[INFO] crate crates.io crate urpc 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded as-slice v0.1.0
[INFO] [stderr]   Downloaded hex v0.4.0
[INFO] [stderr]   Downloaded hash32 v0.1.0
[INFO] [stderr]   Downloaded syn v1.0.8
[INFO] [stderr]   Downloaded heapless v0.5.1
[INFO] [stderr]   Downloaded serde_derive v1.0.102
[INFO] [stderr]   Downloaded postcard v0.4.2
[INFO] [stderr]   Downloaded postcard-cobs v0.1.5-pre
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3338e66c2ba364d0f929778a2df550da1c4e8417300f9b1c8682f06284dc4dc5
[INFO] running `Command { std: "docker" "start" "-a" "3338e66c2ba364d0f929778a2df550da1c4e8417300f9b1c8682f06284dc4dc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3338e66c2ba364d0f929778a2df550da1c4e8417300f9b1c8682f06284dc4dc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3338e66c2ba364d0f929778a2df550da1c4e8417300f9b1c8682f06284dc4dc5", kill_on_drop: false }`
[INFO] [stdout] 3338e66c2ba364d0f929778a2df550da1c4e8417300f9b1c8682f06284dc4dc5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-66/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d18eb9a418a0e83cc5c2fdfe1f39e765ca64596e9702dfb595f45efa8f14e373
[INFO] running `Command { std: "docker" "start" "-a" "d18eb9a418a0e83cc5c2fdfe1f39e765ca64596e9702dfb595f45efa8f14e373", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling serde v1.0.102
[INFO] [stderr]    Compiling heapless v0.5.1
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking postcard-cobs v0.1.5-pre
[INFO] [stderr]     Checking hex v0.4.0
[INFO] [stderr]     Checking hash32 v0.1.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]     Checking as-slice v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.102
[INFO] [stderr]     Checking postcard v0.4.2
[INFO] [stderr]     Checking urpc v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/client.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use core::mem::{self, swap};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/client.rs:7:17
[INFO] [stdout]   |
[INFO] [stdout] 7 | use core::mem::{self, swap};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `write_buf_len` is never read
[INFO] [stdout]   --> examples/requests.rs:76:17
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let mut write_buf_len = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `read_len` is never read
[INFO] [stdout]   --> examples/requests.rs:86:21
[INFO] [stdout]    |
[INFO] [stdout] 86 |                     read_len = consts::REQ_HEADER_LEN;
[INFO] [stdout]    |                     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/requests.rs:99:37
[INFO] [stdout]    |
[INFO] [stdout] 99 | ...                   let mut opt_buf = recv_bytes.get_opt_buf(&mut write_buf);
[INFO] [stdout]    |                           ----^^^^^^^
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `buf_len` should have an upper case name
[INFO] [stdout]   --> examples/requests.rs:29:11
[INFO] [stdout]    |
[INFO] [stdout] 29 |     const buf_len: usize = 4096;
[INFO] [stdout]    |           ^^^^^^^ help: convert the identifier to upper case: `BUF_LEN`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.18s
[INFO] running `Command { std: "docker" "inspect" "d18eb9a418a0e83cc5c2fdfe1f39e765ca64596e9702dfb595f45efa8f14e373", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d18eb9a418a0e83cc5c2fdfe1f39e765ca64596e9702dfb595f45efa8f14e373", kill_on_drop: false }`
[INFO] [stdout] d18eb9a418a0e83cc5c2fdfe1f39e765ca64596e9702dfb595f45efa8f14e373