[INFO] cloning repository https://github.com/google/mosaic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/google/mosaic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoogle%2Fmosaic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoogle%2Fmosaic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 345566951a795e69809dca52619631821e2897ed
[INFO] documenting google/mosaic against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoogle%2Fmosaic" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/google/mosaic on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-1/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/google/mosaic
[INFO] finished tweaking git repo https://github.com/google/mosaic
[INFO] tweaked toml for git repo https://github.com/google/mosaic written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/google/mosaic already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "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] ac6003e03cc58dab3175b01e17b2cbe3523f5997b5a6d5345587cd77554fecb6
[INFO] running `Command { std: "docker" "start" "-a" "ac6003e03cc58dab3175b01e17b2cbe3523f5997b5a6d5345587cd77554fecb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac6003e03cc58dab3175b01e17b2cbe3523f5997b5a6d5345587cd77554fecb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac6003e03cc58dab3175b01e17b2cbe3523f5997b5a6d5345587cd77554fecb6", kill_on_drop: false }`
[INFO] [stdout] ac6003e03cc58dab3175b01e17b2cbe3523f5997b5a6d5345587cd77554fecb6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5019a6f51186d03af512ce12480a0eec0d5ca1a13c9598b7a3b440111442eba1
[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" "5019a6f51186d03af512ce12480a0eec0d5ca1a13c9598b7a3b440111442eba1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling syn v1.0.36
[INFO] [stderr]    Compiling unindent v0.1.6
[INFO] [stderr]     Checking cc v1.0.58
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling clang-sys v1.2.0
[INFO] [stderr]     Checking codespan-reporting v0.9.5
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking codespan v0.9.5
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking clang v1.0.3
[INFO] [stderr]     Checking cc_use_common v0.1.0 (/opt/rustwide/workdir/cc_use_common)
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.3
[INFO] [stderr]    Compiling rental-impl v0.5.5
[INFO] [stderr]    Compiling salsa-macros v0.14.1
[INFO] [stderr]    Compiling gen_macro_impl v0.1.0 (/opt/rustwide/workdir/gen_macro/impl)
[INFO] [stderr]    Compiling proc-macro-error v1.0.3
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]     Checking gen_macro v0.1.0 (/opt/rustwide/workdir/gen_macro)
[INFO] [stderr]     Checking salsa v0.14.4
[INFO] [stderr]     Checking structopt v0.3.15
[INFO] [stderr]     Checking serde v1.0.114
[INFO] [stderr]     Checking rental v0.5.6
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking trybuild v1.0.30 (https://github.com/tmandry/trybuild.git?branch=strategy#1a5990c4)
[INFO] [stderr]     Checking mosaic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting mosaic v0.1.0 (/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(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `procedural-masquerade` crate
[INFO] [stdout]    --> src/libclang/mod.rs:310:1
[INFO] [stdout]     |
[INFO] [stdout] 310 | / rental! {
[INFO] [stdout] 311 | |     mod rent {
[INFO] [stdout] 312 | |         use super::*;
[INFO] [stdout] 313 | |
[INFO] [stdout] ...   |
[INFO] [stdout] 347 | |     }
[INFO] [stdout] 348 | | }
[INFO] [stdout]     | |_^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(proc_macro_back_compat)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #83125 <https://github.com/rust-lang/rust/issues/83125>
[INFO] [stdout]     = note: The `procedural-masquerade` crate has been unnecessary since Rust 1.30.0. Versions of this crate below 0.1.7 will eventually stop compiling.
[INFO] [stdout]     = note: this warning originates in the macro `rental` (in Nightly builds, run with -Z macro-backtrace for more info)
[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 `mosaic`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name mosaic 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 cc_crate=/opt/rustwide/target/debug/deps/libcc-0cec6f164eee197f.rmeta --extern cc_use_common=/opt/rustwide/target/debug/deps/libcc_use_common-35e9eb47d3901501.rmeta --extern clang=/opt/rustwide/target/debug/deps/libclang-f97d09fcc5271caf.rmeta --extern clang_sys=/opt/rustwide/target/debug/deps/libclang_sys-fb528ee359effbed.rmeta --extern codespan=/opt/rustwide/target/debug/deps/libcodespan-b2b0a6c90b3d8ab6.rmeta --extern codespan_reporting=/opt/rustwide/target/debug/deps/libcodespan_reporting-298365c3cb1c35a1.rmeta --extern gen_macro=/opt/rustwide/target/debug/deps/libgen_macro-e28c1a2e5e3b55c6.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-0afb4b0f5d1f045c.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-f78c7d58315fea95.rmeta --extern rental=/opt/rustwide/target/debug/deps/librental-d8f6c53531011977.rmeta --extern salsa=/opt/rustwide/target/debug/deps/libsalsa-daa9f7c7f9469a96.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-a1bed855920fc57e.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-7e7c1cda3a16be50.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-b6a302702d84dc8f.rmeta --extern termcolor=/opt/rustwide/target/debug/deps/libtermcolor-31442782caf7474c.rmeta --extern trybuild=/opt/rustwide/target/debug/deps/libtrybuild-3e6597d650d0d884.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5019a6f51186d03af512ce12480a0eec0d5ca1a13c9598b7a3b440111442eba1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5019a6f51186d03af512ce12480a0eec0d5ca1a13c9598b7a3b440111442eba1", kill_on_drop: false }`
[INFO] [stdout] 5019a6f51186d03af512ce12480a0eec0d5ca1a13c9598b7a3b440111442eba1
