[INFO] fetching crate matrixcompare 0.3.0...
[INFO] testing matrixcompare-0.3.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate matrixcompare 0.3.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate matrixcompare 0.3.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate matrixcompare 0.3.0
[INFO] tweaked toml for crates.io crate matrixcompare 0.3.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate matrixcompare 0.3.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate matrixcompare 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded matrixcompare-core v0.1.0
[INFO] [stderr]   Downloaded output_vt100 v0.1.2
[INFO] [stderr]   Downloaded matrixcompare-mock v0.1.0
[INFO] [stderr]   Downloaded num-complex v0.3.1
[INFO] [stderr]   Downloaded redox_syscall v0.2.7
[INFO] [stderr]   Downloaded num-rational v0.3.2
[INFO] [stderr]   Downloaded pretty_assertions v0.6.1
[INFO] [stderr]   Downloaded num-bigint v0.3.2
[INFO] [stderr]   Downloaded num-iter v0.1.42
[INFO] [stderr]   Downloaded num v0.3.1
[INFO] [stderr]   Downloaded difference v2.0.0
[INFO] [stderr]   Downloaded proptest v0.10.1
[INFO] [stderr]   Downloaded syn v1.0.71
[INFO] [stderr]   Downloaded proptest v1.0.0
[INFO] [stderr]   Downloaded rand_xorshift v0.2.0
[INFO] [stderr]   Downloaded libc v0.2.94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 21ca3853c1d9fb75847257ce10fbdc5b51b4abf301be159cb246807ea23f05ff
[INFO] running `Command { std: "docker" "start" "-a" "21ca3853c1d9fb75847257ce10fbdc5b51b4abf301be159cb246807ea23f05ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21ca3853c1d9fb75847257ce10fbdc5b51b4abf301be159cb246807ea23f05ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21ca3853c1d9fb75847257ce10fbdc5b51b4abf301be159cb246807ea23f05ff", kill_on_drop: false }`
[INFO] [stdout] 21ca3853c1d9fb75847257ce10fbdc5b51b4abf301be159cb246807ea23f05ff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e34b85365265edd57aaf617f93b76136db5fe4f109df8a996f948541b141dd7f
[INFO] running `Command { std: "docker" "start" "-a" "e34b85365265edd57aaf617f93b76136db5fe4f109df8a996f948541b141dd7f", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling matrixcompare-core v0.1.0
[INFO] [stderr]    Compiling matrixcompare v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:54:42
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 | impl_float_ulp!(f32, i32);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 54 -                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout] 54 +                     let a_int = unsafe { f32::to_bits(a.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:55:42
[INFO] [stdout]    |
[INFO] [stdout] 55 |                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 | impl_float_ulp!(f32, i32);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 55 -                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout] 55 +                     let b_int = unsafe { f32::to_bits(b.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:54:42
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 | impl_float_ulp!(f64, i64);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 54 -                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout] 54 +                     let a_int = unsafe { f64::to_bits(a.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:55:42
[INFO] [stdout]    |
[INFO] [stdout] 55 |                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 | impl_float_ulp!(f64, i64);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 55 -                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout] 55 +                     let b_int = unsafe { f64::to_bits(b.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.73s
[INFO] running `Command { std: "docker" "inspect" "e34b85365265edd57aaf617f93b76136db5fe4f109df8a996f948541b141dd7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e34b85365265edd57aaf617f93b76136db5fe4f109df8a996f948541b141dd7f", kill_on_drop: false }`
[INFO] [stdout] e34b85365265edd57aaf617f93b76136db5fe4f109df8a996f948541b141dd7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c54f46630a6b69ec62516e99123ef543d8220fbef161dc3765f0e7f98f76214
[INFO] running `Command { std: "docker" "start" "-a" "5c54f46630a6b69ec62516e99123ef543d8220fbef161dc3765f0e7f98f76214", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling num-bigint v0.3.2
[INFO] [stderr]    Compiling regex-syntax v0.6.23
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling num-complex v0.3.1
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:54:42
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 | impl_float_ulp!(f32, i32);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 54 -                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout] 54 +                     let a_int = unsafe { f32::to_bits(a.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:55:42
[INFO] [stdout]    |
[INFO] [stdout] 55 |                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 | impl_float_ulp!(f32, i32);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 55 -                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout] 55 +                     let b_int = unsafe { f32::to_bits(b.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:54:42
[INFO] [stdout]    |
[INFO] [stdout] 54 |                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 | impl_float_ulp!(f64, i64);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 54 -                     let a_int = unsafe { mem::transmute::<$ftype, $itype>(a.to_owned()) };
[INFO] [stdout] 54 +                     let a_int = unsafe { f64::to_bits(a.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]   --> src/ulp.rs:55:42
[INFO] [stdout]    |
[INFO] [stdout] 55 |                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 | impl_float_ulp!(f64, i64);
[INFO] [stdout]    | ------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `impl_float_ulp` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: replace this with
[INFO] [stdout]    |
[INFO] [stdout] 55 -                     let b_int = unsafe { mem::transmute::<$ftype, $itype>(b.to_owned()) };
[INFO] [stdout] 55 +                     let b_int = unsafe { f64::to_bits(b.to_owned()).cast_signed() };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pretty_assertions v0.6.1
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/num-bigint-0.3.2/src/biguint/convert.rs:70:19
[INFO] [stdout]    |
[INFO] [stdout] 70 |         .div_ceil(&big_digit::BITS.into())
[INFO] [stdout]    |          -------- ^^^^^^^^^^^^^^^^^^^^^^^ expected `u64`, found `&_`
[INFO] [stdout]    |          |
[INFO] [stdout]    |          arguments to this method are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected type `u64`
[INFO] [stdout]            found reference `&_`
[INFO] [stdout] note: method defined here
[INFO] [stdout]   --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/num/mod.rs:1151:5
[INFO] [stdout]    = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 70 -         .div_ceil(&big_digit::BITS.into())
[INFO] [stdout] 70 +         .div_ceil(big_digit::BITS.into())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/num-bigint-0.3.2/src/biguint/convert.rs:585:19
[INFO] [stdout]     |
[INFO] [stdout] 585 |         .div_ceil(&u64::from(bits))
[INFO] [stdout]     |          -------- ^^^^^^^^^^^^^^^^ expected `u64`, found `&u64`
[INFO] [stdout]     |          |
[INFO] [stdout]     |          arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/num/mod.rs:1151:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]     |
[INFO] [stdout] 585 -         .div_ceil(&u64::from(bits))
[INFO] [stdout] 585 +         .div_ceil(u64::from(bits))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/num-bigint-0.3.2/src/biguint/convert.rs:613:19
[INFO] [stdout]     |
[INFO] [stdout] 613 |         .div_ceil(&u64::from(bits))
[INFO] [stdout]     |          -------- ^^^^^^^^^^^^^^^^ expected `u64`, found `&u64`
[INFO] [stdout]     |          |
[INFO] [stdout]     |          arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/num/mod.rs:1151:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]     |
[INFO] [stdout] 613 -         .div_ceil(&u64::from(bits))
[INFO] [stdout] 613 +         .div_ceil(u64::from(bits))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/num-bigint-0.3.2/src/biguint.rs:393:54
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 let root_scale = extra_bits.div_ceil(&n64);
[INFO] [stdout]     |                                             -------- ^^^^ expected `u64`, found `&u64`
[INFO] [stdout]     |                                             |
[INFO] [stdout]     |                                             arguments to this method are incorrect
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/num/mod.rs:1151:5
[INFO] [stdout]     = note: this error originates in the macro `uint_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]     |
[INFO] [stdout] 393 -                 let root_scale = extra_bits.div_ceil(&n64);
[INFO] [stdout] 393 +                 let root_scale = extra_bits.div_ceil(n64);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_xorshift v0.2.0
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `num-bigint` (lib) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5c54f46630a6b69ec62516e99123ef543d8220fbef161dc3765f0e7f98f76214", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c54f46630a6b69ec62516e99123ef543d8220fbef161dc3765f0e7f98f76214", kill_on_drop: false }`
[INFO] [stdout] 5c54f46630a6b69ec62516e99123ef543d8220fbef161dc3765f0e7f98f76214
