[INFO] fetching crate urpc 0.2.0...
[INFO] checking urpc-0.2.0 against try#6f12b8fe67b4eed2e838dab803ed9493b9d62c0f for pr-79073
[INFO] extracting crate urpc 0.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate urpc 0.2.0 on toolchain 6f12b8fe67b4eed2e838dab803ed9493b9d62c0f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "read-manifest" "--manifest-path" "Cargo.toml", 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-13/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" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "fetch" "--locked" "--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 serde_derive v1.0.102
[INFO] [stderr]   Downloaded heapless v0.5.1
[INFO] [stderr]   Downloaded hash32 v0.1.0
[INFO] [stderr]   Downloaded postcard v0.4.2
[INFO] [stderr]   Downloaded as-slice v0.1.0
[INFO] [stderr]   Downloaded postcard-cobs v0.1.5-pre
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2edcce07907027f3f4693afa375bab778cadb590182915bf51fcccd77dd6cc2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f2edcce07907027f3f4693afa375bab778cadb590182915bf51fcccd77dd6cc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2edcce07907027f3f4693afa375bab778cadb590182915bf51fcccd77dd6cc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2edcce07907027f3f4693afa375bab778cadb590182915bf51fcccd77dd6cc2", kill_on_drop: false }`
[INFO] [stdout] f2edcce07907027f3f4693afa375bab778cadb590182915bf51fcccd77dd6cc2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34abc7fbb99afb273e1f7a8b74824dbdd60cd062393901b03e0949244f798060
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "34abc7fbb99afb273e1f7a8b74824dbdd60cd062393901b03e0949244f798060", kill_on_drop: false }`
[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 postcard-cobs v0.1.5-pre
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]     Checking as-slice v0.1.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking hash32 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:76:13
[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 32.20s
[INFO] running `Command { std: "docker" "inspect" "34abc7fbb99afb273e1f7a8b74824dbdd60cd062393901b03e0949244f798060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34abc7fbb99afb273e1f7a8b74824dbdd60cd062393901b03e0949244f798060", kill_on_drop: false }`
[INFO] [stdout] 34abc7fbb99afb273e1f7a8b74824dbdd60cd062393901b03e0949244f798060