[INFO] fetching crate twirl 0.1.1...
[INFO] documenting twirl-0.1.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate twirl 0.1.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate twirl 0.1.1 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twirl 0.1.1
[INFO] finished tweaking crates.io crate twirl 0.1.1
[INFO] tweaked toml for crates.io crate twirl 0.1.1 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", 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] aa26f4f559cc5d7e61310f1e4c08f4bb43e502b580923455bd890fdc5a2c27bd
[INFO] running `Command { std: "docker" "start" "-a" "aa26f4f559cc5d7e61310f1e4c08f4bb43e502b580923455bd890fdc5a2c27bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa26f4f559cc5d7e61310f1e4c08f4bb43e502b580923455bd890fdc5a2c27bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa26f4f559cc5d7e61310f1e4c08f4bb43e502b580923455bd890fdc5a2c27bd", kill_on_drop: false }`
[INFO] [stdout] aa26f4f559cc5d7e61310f1e4c08f4bb43e502b580923455bd890fdc5a2c27bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 642212a2553ff05d39b050df158fb34c2d986d3d7b610ef65d6c40f8a3d32013
[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" "642212a2553ff05d39b050df158fb34c2d986d3d7b610ef65d6c40f8a3d32013", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tower-service v0.3.0-alpha.2
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking openssl-sys v0.9.58
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking flate2 v1.0.17
[INFO] [stderr]     Checking serde-value v0.5.3
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking serde-hjson v0.8.2
[INFO] [stderr]    Compiling tokio-macros v0.2.0-alpha.6
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking openssl v0.10.30
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking ffi-support v0.3.5
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking tokio-io v0.2.0-alpha.6
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking tokio-codec v0.2.0-alpha.6
[INFO] [stderr]     Checking tower-make v0.3.0-alpha.2a
[INFO] [stderr]     Checking config v0.8.0
[INFO] [stderr]     Checking log4rs v0.8.3
[INFO] [stderr]     Checking http-body v0.2.0-alpha.3
[INFO] [stderr]     Checking connect v0.1.1
[INFO] [stderr]     Checking native-tls v0.2.4
[INFO] [stderr]     Checking tokio-tls v0.3.0-alpha.6
[INFO] [stderr]     Checking tokio-sync v0.2.0-alpha.6
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tokio-executor v0.2.0-alpha.6
[INFO] [stderr]     Checking h2 v0.2.0-alpha.3
[INFO] [stderr]     Checking tokio-net v0.2.0-alpha.6
[INFO] [stderr]     Checking tokio-timer v0.3.0-alpha.6
[INFO] [stderr]     Checking tokio-fs v0.2.0-alpha.6
[INFO] [stderr]     Checking tokio v0.2.0-alpha.6
[INFO] [stderr]     Checking hyper v0.13.0-alpha.4
[INFO] [stderr]     Checking hyper-tls v0.4.0-alpha.4
[INFO] [stderr]  Documenting twirl v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(in_band_lifetimes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `twirl`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-type rlib --crate-name twirl src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-da8430b608821380.rmeta --extern connect=/opt/rustwide/target/debug/deps/libconnect-a9ef8363ca9d9792.rmeta --extern ffi_support=/opt/rustwide/target/debug/deps/libffi_support-ce1f11ab6413b9fc.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-b4251fee69449d9c.rmeta --extern futures_util=/opt/rustwide/target/debug/deps/libfutures_util-ca98b0b3d70ba13e.rmeta --extern http=/opt/rustwide/target/debug/deps/libhttp-9e1c91796c0f7fd4.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-3b81f794c7ccf3ab.rmeta --extern hyper_tls=/opt/rustwide/target/debug/deps/libhyper_tls-38a47bda8aec7b2e.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5429dd6d097468fb.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-7a13edba2cab3d33.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-6755a24efcfc79e1.rmeta --extern simple_error=/opt/rustwide/target/debug/deps/libsimple_error-52511863dc50af23.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-0f071b3a0e8eb270.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-762ba2e1e45d868f.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "642212a2553ff05d39b050df158fb34c2d986d3d7b610ef65d6c40f8a3d32013", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "642212a2553ff05d39b050df158fb34c2d986d3d7b610ef65d6c40f8a3d32013", kill_on_drop: false }`
[INFO] [stdout] 642212a2553ff05d39b050df158fb34c2d986d3d7b610ef65d6c40f8a3d32013