[INFO] fetching crate avr-progmem 0.1.0...
[INFO] checking avr-progmem-0.1.0 against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] extracting crate avr-progmem 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate avr-progmem 0.1.0 on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate avr-progmem 0.1.0
[INFO] finished tweaking crates.io crate avr-progmem 0.1.0
[INFO] tweaked toml for crates.io crate avr-progmem 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate avr-progmem 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1541b561e872ee6a6e381f65e3bf69cb7239c721e08dcba4abae00e454e1db38
[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" "1541b561e872ee6a6e381f65e3bf69cb7239c721e08dcba4abae00e454e1db38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1541b561e872ee6a6e381f65e3bf69cb7239c721e08dcba4abae00e454e1db38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1541b561e872ee6a6e381f65e3bf69cb7239c721e08dcba4abae00e454e1db38", kill_on_drop: false }`
[INFO] [stdout] 1541b561e872ee6a6e381f65e3bf69cb7239c721e08dcba4abae00e454e1db38
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ed1450f3b1e14eb1cfb6f953fb2a2c526e0149a3c9cee6986ea44c903156732f
[INFO] running `Command { std: "docker" "start" "-a" "ed1450f3b1e14eb1cfb6f953fb2a2c526e0149a3c9cee6986ea44c903156732f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.20
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.40
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]     Checking ufmt-write v0.1.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking panic-halt v0.2.0
[INFO] [stderr]     Checking avr-progmem v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `size_bytes`
[INFO] [stdout]    --> src/lib.rs:657:6
[INFO] [stdout]     |
[INFO] [stdout] 657 |     let size_bytes = size_bytes as u8;
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_size_bytes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_byte_loop_raw`
[INFO] [stdout]    --> src/lib.rs:587:11
[INFO] [stdout]     |
[INFO] [stdout] 587 | unsafe fn read_byte_loop_raw<T>(p_addr: *const T, out: *mut T, len: u8)
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling ufmt-macros v0.1.1
[INFO] [stderr]     Checking ufmt v0.1.0
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `arduino_uno`
[INFO] [stdout]   --> examples/printer/mod.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use arduino_uno::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^ use of undeclared crate or module `arduino_uno`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `size_bytes`
[INFO] [stdout]    --> src/lib.rs:657:6
[INFO] [stdout]     |
[INFO] [stdout] 657 |     let size_bytes = size_bytes as u8;
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_size_bytes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> examples/uno-serial.rs:119:2
[INFO] [stdout]     |
[INFO] [stdout] 115 |       std::process::exit(0);
[INFO] [stdout]     |       --------------------- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 119 |       loop {
[INFO] [stdout]     |  _____^
[INFO] [stdout] 120 | |         // Done, just do nothing
[INFO] [stdout] 121 | |     }
[INFO] [stdout]     | |_____^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `avr-progmem`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function is never used: `read_byte_loop_raw`
[INFO] [stdout]    --> src/lib.rs:587:11
[INFO] [stdout]     |
[INFO] [stdout] 587 | unsafe fn read_byte_loop_raw<T>(p_addr: *const T, out: *mut T, len: u8)
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ed1450f3b1e14eb1cfb6f953fb2a2c526e0149a3c9cee6986ea44c903156732f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed1450f3b1e14eb1cfb6f953fb2a2c526e0149a3c9cee6986ea44c903156732f", kill_on_drop: false }`
[INFO] [stdout] ed1450f3b1e14eb1cfb6f953fb2a2c526e0149a3c9cee6986ea44c903156732f