[INFO] fetching crate mtpng 0.3.4...
[INFO] checking mtpng-0.3.4 against try#81275a1445c7502a974118e0c69b795ab60be991 for pr-80243
[INFO] extracting crate mtpng 0.3.4 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mtpng 0.3.4 on toolchain 81275a1445c7502a974118e0c69b795ab60be991
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mtpng 0.3.4
[INFO] finished tweaking crates.io crate mtpng 0.3.4
[INFO] tweaked toml for crates.io crate mtpng 0.3.4 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate mtpng 0.3.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-iter v0.1.37
[INFO] [stderr]   Downloaded redox_syscall v0.1.51
[INFO] [stderr]   Downloaded png v0.12.0
[INFO] [stderr]   Downloaded num-integer v0.1.39
[INFO] [stderr]   Downloaded deflate v0.7.19
[INFO] [stderr]   Downloaded cc v1.0.31
[INFO] [stderr]   Downloaded num-traits v0.2.6
[INFO] [stderr]   Downloaded num_cpus v1.10.0
[INFO] [stderr]   Downloaded libc v0.2.50
[INFO] [stderr]   Downloaded winapi v0.3.6
[INFO] [stderr]   Downloaded either v1.5.1
[INFO] [stderr]   Downloaded cfg-if v0.1.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d9cce2c966906d9a679e7641209c54ccc7b61d16a31f95b460cd77c0d76ee563
[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" "d9cce2c966906d9a679e7641209c54ccc7b61d16a31f95b460cd77c0d76ee563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9cce2c966906d9a679e7641209c54ccc7b61d16a31f95b460cd77c0d76ee563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9cce2c966906d9a679e7641209c54ccc7b61d16a31f95b460cd77c0d76ee563", kill_on_drop: false }`
[INFO] [stdout] d9cce2c966906d9a679e7641209c54ccc7b61d16a31f95b460cd77c0d76ee563
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cdaeabc8ffbb8c9a3ae6d3f93cd3fff4fe451d226c14d0d8deba5a251b8a0e68
[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" "cdaeabc8ffbb8c9a3ae6d3f93cd3fff4fe451d226c14d0d8deba5a251b8a0e68", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]    Compiling cc v1.0.31
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]     Checking either v1.5.1
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stderr]     Checking mtpng v0.3.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the type `libz_sys::z_stream` does not permit zero-initialization
[INFO] [stdout]    --> src/deflate.rs:150:17
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 mem::MaybeUninit::zeroed().assume_init()
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 this code causes undefined behavior when executed
[INFO] [stdout]     |                 help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] note: function pointers must be non-null (in this struct field)
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libz-sys-1.0.25/src/lib.rs:57:5
[INFO] [stdout]     |
[INFO] [stdout] 57  |     pub zalloc: alloc_func,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `libz_sys::z_stream` does not permit zero-initialization
[INFO] [stdout]    --> src/deflate.rs:150:17
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 mem::MaybeUninit::zeroed().assume_init()
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 this code causes undefined behavior when executed
[INFO] [stdout]     |                 help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] note: function pointers must be non-null (in this struct field)
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libz-sys-1.0.25/src/lib.rs:57:5
[INFO] [stdout]     |
[INFO] [stdout] 57  |     pub zalloc: alloc_func,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.31s
[INFO] running `Command { std: "docker" "inspect" "cdaeabc8ffbb8c9a3ae6d3f93cd3fff4fe451d226c14d0d8deba5a251b8a0e68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdaeabc8ffbb8c9a3ae6d3f93cd3fff4fe451d226c14d0d8deba5a251b8a0e68", kill_on_drop: false }`
[INFO] [stdout] cdaeabc8ffbb8c9a3ae6d3f93cd3fff4fe451d226c14d0d8deba5a251b8a0e68