[INFO] fetching crate installer 0.1.0-alpha1...
[INFO] checking installer-0.1.0-alpha1 against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124157
[INFO] extracting crate installer 0.1.0-alpha1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate installer 0.1.0-alpha1 on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate installer 0.1.0-alpha1
[INFO] finished tweaking crates.io crate installer 0.1.0-alpha1
[INFO] tweaked toml for crates.io crate installer 0.1.0-alpha1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate installer 0.1.0-alpha1 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" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded zeroize v1.1.0
[INFO] [stderr]   Downloaded rsa v0.3.0
[INFO] [stderr]   Downloaded pem v0.8.1
[INFO] [stderr]   Downloaded zeroize_derive v1.0.0
[INFO] [stderr]   Downloaded cpuid-bool v0.1.0
[INFO] [stderr]   Downloaded libflate_lz77 v1.0.0
[INFO] [stderr]   Downloaded networking v0.1.2
[INFO] [stderr]   Downloaded simple_asn1 v0.4.0
[INFO] [stderr]   Downloaded dirs v3.0.1
[INFO] [stderr]   Downloaded filetime v0.2.10
[INFO] [stderr]   Downloaded libflate v1.0.2
[INFO] [stderr]   Downloaded bincode v1.3.1
[INFO] [stderr]   Downloaded rle-decode-fast v1.0.1
[INFO] [stderr]   Downloaded ipc-channel v0.14.1
[INFO] [stderr]   Downloaded num-bigint-dig v0.6.0
[INFO] [stderr]   Downloaded tar v0.4.29
[INFO] [stderr]   Downloaded manager v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d17668d07dd1be9e1bc6eef8f8ed5e45d69bc9e70b042cab381a764f2875cca1
[INFO] running `Command { std: "docker" "start" "-a" "d17668d07dd1be9e1bc6eef8f8ed5e45d69bc9e70b042cab381a764f2875cca1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d17668d07dd1be9e1bc6eef8f8ed5e45d69bc9e70b042cab381a764f2875cca1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d17668d07dd1be9e1bc6eef8f8ed5e45d69bc9e70b042cab381a764f2875cca1", kill_on_drop: false }`
[INFO] [stdout] d17668d07dd1be9e1bc6eef8f8ed5e45d69bc9e70b042cab381a764f2875cca1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=forbid" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ceb06b56e25165dff09a3ec0042188434b46d5ce1ddec15584959a168e3b4aeb
[INFO] running `Command { std: "docker" "start" "-a" "ceb06b56e25165dff09a3ec0042188434b46d5ce1ddec15584959a168e3b4aeb", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling generic-array v0.14.3
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]    Compiling num-bigint-dig v0.6.0
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking smallvec v1.4.1
[INFO] [stderr]     Checking cpuid-bool v0.1.0
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling serde_json v1.0.56
[INFO] [stderr]     Checking sha2 v0.9.1
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking simple_asn1 v0.4.0
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking subtle v2.2.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stdout] error[E0310]: the parameter type `T` may not live long enough
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rustc-serialize-0.3.24/src/serialize.rs:1155:5
[INFO] [stdout]      |
[INFO] [stdout] 1155 |     fn decode<D: Decoder>(d: &mut D) -> Result<Cow<'static, T>, D::Error> {
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |     |
[INFO] [stdout]      |     the parameter type `T` must be valid for the static lifetime...
[INFO] [stdout]      |     ...so that the type `T` will meet its required lifetime bounds...
[INFO] [stdout]      |
[INFO] [stdout] note: ...that is required by this bound
[INFO] [stdout]     --> /rustc/c2f2db79ca3024f68d22b45aa22b570775c2c4ad/library/alloc/src/borrow.rs:180:30
[INFO] [stdout] help: consider adding an explicit lifetime bound
[INFO] [stdout]      |
[INFO] [stdout] 1151 | impl<'a, T: ?Sized + 'static> Decodable for Cow<'a, T>
[INFO] [stdout]      |                    +++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking pem v0.8.1
[INFO] [stderr]     Checking filetime v0.2.10
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking xattr v0.2.2
[INFO] [stderr]     Checking libflate_lz77 v1.0.0
[INFO] [stderr]     Checking rle-decode-fast v1.0.1
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking ipc-channel v0.14.1
[INFO] [stderr]     Checking libflate v1.0.2
[INFO] [stderr]     Checking rsa v0.3.0
[INFO] [stderr]     Checking tar v0.4.29
[INFO] [stderr]     Checking dirs v3.0.1
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0310`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-serialize` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ceb06b56e25165dff09a3ec0042188434b46d5ce1ddec15584959a168e3b4aeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ceb06b56e25165dff09a3ec0042188434b46d5ce1ddec15584959a168e3b4aeb", kill_on_drop: false }`
[INFO] [stdout] ceb06b56e25165dff09a3ec0042188434b46d5ce1ddec15584959a168e3b4aeb
[INFO] checking installer-0.1.0-alpha1 against try#9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88 for pr-124157
[INFO] extracting crate installer 0.1.0-alpha1 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate installer 0.1.0-alpha1 on toolchain 9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate installer 0.1.0-alpha1
[INFO] finished tweaking crates.io crate installer 0.1.0-alpha1
[INFO] tweaked toml for crates.io crate installer 0.1.0-alpha1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate installer 0.1.0-alpha1 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" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 381004f7625c8a0cb56f89e4684fb49ea6db65c8b9e5bc706048237947eadd8d
[INFO] running `Command { std: "docker" "start" "-a" "381004f7625c8a0cb56f89e4684fb49ea6db65c8b9e5bc706048237947eadd8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "381004f7625c8a0cb56f89e4684fb49ea6db65c8b9e5bc706048237947eadd8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "381004f7625c8a0cb56f89e4684fb49ea6db65c8b9e5bc706048237947eadd8d", kill_on_drop: false }`
[INFO] [stdout] 381004f7625c8a0cb56f89e4684fb49ea6db65c8b9e5bc706048237947eadd8d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a23a544f2d38d94e529d03394d9c2c2fcfda44d02189678f20727a46a9ced17
[INFO] running `Command { std: "docker" "start" "-a" "6a23a544f2d38d94e529d03394d9c2c2fcfda44d02189678f20727a46a9ced17", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling generic-array v0.14.3
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling num-bigint-dig v0.6.0
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling serde_json v1.0.56
[INFO] [stderr]     Checking smallvec v1.4.1
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]     Checking cpuid-bool v0.1.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking simple_asn1 v0.4.0
[INFO] [stderr]     Checking sha2 v0.9.1
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking subtle v2.2.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stdout] error[E0310]: the parameter type `T` may not live long enough
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rustc-serialize-0.3.24/src/serialize.rs:1155:5
[INFO] [stdout]      |
[INFO] [stdout] 1155 |     fn decode<D: Decoder>(d: &mut D) -> Result<Cow<'static, T>, D::Error> {
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |     |
[INFO] [stdout]      |     the parameter type `T` must be valid for the static lifetime...
[INFO] [stdout]      |     ...so that the type `T` will meet its required lifetime bounds...
[INFO] [stdout]      |
[INFO] [stdout] note: ...that is required by this bound
[INFO] [stdout]     --> /rustc/9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88/library/alloc/src/borrow.rs:180:30
[INFO] [stdout] help: consider adding an explicit lifetime bound
[INFO] [stdout]      |
[INFO] [stdout] 1151 | impl<'a, T: ?Sized + 'static> Decodable for Cow<'a, T>
[INFO] [stdout]      |                    +++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking filetime v0.2.10
[INFO] [stderr]     Checking pem v0.8.1
[INFO] [stderr]     Checking xattr v0.2.2
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking libflate_lz77 v1.0.0
[INFO] [stderr]     Checking rle-decode-fast v1.0.1
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking dirs v3.0.1
[INFO] [stderr]     Checking libflate v1.0.2
[INFO] [stderr]     Checking ipc-channel v0.14.1
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking tar v0.4.29
[INFO] [stderr]     Checking rsa v0.3.0
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0310`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-serialize` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "6a23a544f2d38d94e529d03394d9c2c2fcfda44d02189678f20727a46a9ced17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a23a544f2d38d94e529d03394d9c2c2fcfda44d02189678f20727a46a9ced17", kill_on_drop: false }`
[INFO] [stdout] 6a23a544f2d38d94e529d03394d9c2c2fcfda44d02189678f20727a46a9ced17
