[INFO] fetching crate mhash 0.3.0...
[INFO] testing mhash-0.3.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate mhash 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate mhash 0.3.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate mhash 0.3.0
[INFO] finished tweaking crates.io crate mhash 0.3.0
[INFO] tweaked toml for crates.io crate mhash 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded varmint v0.1.3
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 260cf31ee590b85dc6d911af852035755751f8e39447e78119863a8382c3d65b
[INFO] running `"docker" "start" "-a" "260cf31ee590b85dc6d911af852035755751f8e39447e78119863a8382c3d65b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling smallvec v0.2.1
[INFO] [stderr]    Compiling varmint v0.1.3
[INFO] [stderr]    Compiling bs58 v0.2.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling error-chain v0.5.0
[INFO] [stderr]    Compiling mhash v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: lint `fat_ptr_transmutes` has been removed: `was accidentally removed back in 2014`
[INFO] [stderr]  --> src/lib.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![warn(fat_ptr_transmutes)]
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `redundant_closure`
[INFO] [stderr]  --> src/error.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(redundant_closure)] // Caused by error_chain!
[INFO] [stderr]   |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `len_without_is_empty`
[INFO] [stderr]   --> src/multihash.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[allow(len_without_is_empty)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/variant.rs:88:20
[INFO] [stderr]    |
[INFO] [stderr] 88 |             0x0400 ... 0x040f => ApplicationSpecific { code: code },
[INFO] [stderr]    |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'bs58::decode::DecodeError': Use `bs58::decode::Error` instead
[INFO] [stderr]   --> src/error.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             bs58::decode::DecodeError, Base58;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/multihash_vec.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |             let mut writer = &mut bytes;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.96s
[INFO] running `"docker" "inspect" "260cf31ee590b85dc6d911af852035755751f8e39447e78119863a8382c3d65b"`
[INFO] running `"docker" "rm" "-f" "260cf31ee590b85dc6d911af852035755751f8e39447e78119863a8382c3d65b"`
[INFO] [stdout] 260cf31ee590b85dc6d911af852035755751f8e39447e78119863a8382c3d65b
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f9f5b02f4937e3c7c0565f796bc153d7f7b0640f3eefd12c46c4fc4ac02b98f4
[INFO] running `"docker" "start" "-a" "f9f5b02f4937e3c7c0565f796bc153d7f7b0640f3eefd12c46c4fc4ac02b98f4"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling mhash v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: lint `fat_ptr_transmutes` has been removed: `was accidentally removed back in 2014`
[INFO] [stderr]  --> src/lib.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![warn(fat_ptr_transmutes)]
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `redundant_closure`
[INFO] [stderr]  --> src/error.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(redundant_closure)] // Caused by error_chain!
[INFO] [stderr]   |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `len_without_is_empty`
[INFO] [stderr]   --> src/multihash.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[allow(len_without_is_empty)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/variant.rs:88:20
[INFO] [stderr]    |
[INFO] [stderr] 88 |             0x0400 ... 0x040f => ApplicationSpecific { code: code },
[INFO] [stderr]    |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'bs58::decode::DecodeError': Use `bs58::decode::Error` instead
[INFO] [stderr]   --> src/error.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             bs58::decode::DecodeError, Base58;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/multihash_vec.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |             let mut writer = &mut bytes;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: lint `fat_ptr_transmutes` has been removed: `was accidentally removed back in 2014`
[INFO] [stderr]  --> src/lib.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![warn(fat_ptr_transmutes)]
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `redundant_closure`
[INFO] [stderr]  --> src/error.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(redundant_closure)] // Caused by error_chain!
[INFO] [stderr]   |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `len_without_is_empty`
[INFO] [stderr]   --> src/multihash.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[allow(len_without_is_empty)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/variant.rs:88:20
[INFO] [stderr]    |
[INFO] [stderr] 88 |             0x0400 ... 0x040f => ApplicationSpecific { code: code },
[INFO] [stderr]    |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'bs58::decode::DecodeError': Use `bs58::decode::Error` instead
[INFO] [stderr]   --> src/error.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             bs58::decode::DecodeError, Base58;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/multihash_vec.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |             let mut writer = &mut bytes;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:83:9
[INFO] [stderr]    |
[INFO] [stderr] 83 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]    --> src/read.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         buffer.read_multihash().is_err();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]    --> src/read.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |         buffer.read_multihash().is_err();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `"docker" "inspect" "f9f5b02f4937e3c7c0565f796bc153d7f7b0640f3eefd12c46c4fc4ac02b98f4"`
[INFO] running `"docker" "rm" "-f" "f9f5b02f4937e3c7c0565f796bc153d7f7b0640f3eefd12c46c4fc4ac02b98f4"`
[INFO] [stdout] f9f5b02f4937e3c7c0565f796bc153d7f7b0640f3eefd12c46c4fc4ac02b98f4
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 24a9a22ed52bad7e56d7c9b73bce747dd4d6f3542e88f83248769d22978377af
[INFO] running `"docker" "start" "-a" "24a9a22ed52bad7e56d7c9b73bce747dd4d6f3542e88f83248769d22978377af"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: lint `fat_ptr_transmutes` has been removed: `was accidentally removed back in 2014`
[INFO] [stderr]  --> src/lib.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![warn(fat_ptr_transmutes)]
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `redundant_closure`
[INFO] [stderr]  --> src/error.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(redundant_closure)] // Caused by error_chain!
[INFO] [stderr]   |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `len_without_is_empty`
[INFO] [stderr]   --> src/multihash.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[allow(len_without_is_empty)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/variant.rs:88:20
[INFO] [stderr]    |
[INFO] [stderr] 88 |             0x0400 ... 0x040f => ApplicationSpecific { code: code },
[INFO] [stderr]    |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'bs58::decode::DecodeError': Use `bs58::decode::Error` instead
[INFO] [stderr]   --> src/error.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             bs58::decode::DecodeError, Base58;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/multihash_vec.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |             let mut writer = &mut bytes;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: lint `fat_ptr_transmutes` has been removed: `was accidentally removed back in 2014`
[INFO] [stderr]  --> src/lib.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![warn(fat_ptr_transmutes)]
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `redundant_closure`
[INFO] [stderr]  --> src/error.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![allow(redundant_closure)] // Caused by error_chain!
[INFO] [stderr]   |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `len_without_is_empty`
[INFO] [stderr]   --> src/multihash.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[allow(len_without_is_empty)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/variant.rs:88:20
[INFO] [stderr]    |
[INFO] [stderr] 88 |             0x0400 ... 0x040f => ApplicationSpecific { code: code },
[INFO] [stderr]    |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'bs58::decode::DecodeError': Use `bs58::decode::Error` instead
[INFO] [stderr]   --> src/error.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |             bs58::decode::DecodeError, Base58;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | /     error_chain! {
[INFO] [stderr] 30 | |         links {
[INFO] [stderr] 31 | |             creation::Error, creation::ErrorKind, Creation;
[INFO] [stderr] 32 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 45 | |         }
[INFO] [stderr] 46 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/error.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | /     error_chain! {
[INFO] [stderr] 55 | |         links {
[INFO] [stderr] 56 | |             from_bytes::Error, from_bytes::ErrorKind, FromBytes;
[INFO] [stderr] 57 | |         }
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |         }
[INFO] [stderr] 62 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/multihash_vec.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |             let mut writer = &mut bytes;
[INFO] [stderr]    |                 ----^^^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:83:9
[INFO] [stderr]    |
[INFO] [stderr] 83 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/read.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         buffer.read_multihash().is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]    --> src/read.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         buffer.read_multihash().is_err();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]    --> src/read.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |         buffer.read_multihash().is_err();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you intended to assert that this is err, consider `.unwrap_err()` instead
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/mhash-6a78cc86b56a4870
[INFO] [stdout] 
[INFO] [stdout] running 13 tests
[INFO] [stdout] test read::tests::no_code ... ok
[INFO] [stdout] test write::tests::valid ... ok
[INFO] [stdout] test write::tests::varint ... ok
[INFO] [stdout] test read::tests::valid ... ok
[INFO] [stdout] test multihash_vec::tests::from_bytes_with_varint ... ok
[INFO] [stdout] test multihash_vec::tests::to_bytes ... ok
[INFO] [stdout] test read::tests::valid_varint ... ok
[INFO] [stdout] test multihash_vec::tests::from_bytes ... ok
[INFO] [stdout] test read::tests::no_len ... ok
[INFO] [stdout] test read::tests::short_digest ... ok
[INFO] [stdout] test multihash_vec::tests::to_bytes_with_varint ... ok
[INFO] [stdout] test read::tests::long_digest ... ok
[INFO] [stdout] test read::tests::bad_code ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mhash
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/write.rs - write::WriteMultiHash::write_multihash (line 23) ... ok
[INFO] [stdout] test src/read.rs - read::ReadMultiHash::read_multihash (line 27) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "24a9a22ed52bad7e56d7c9b73bce747dd4d6f3542e88f83248769d22978377af"`
[INFO] running `"docker" "rm" "-f" "24a9a22ed52bad7e56d7c9b73bce747dd4d6f3542e88f83248769d22978377af"`
[INFO] [stdout] 24a9a22ed52bad7e56d7c9b73bce747dd4d6f3542e88f83248769d22978377af