[INFO] cloning repository https://github.com/nikomatsakis/grep-test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nikomatsakis/grep-test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fgrep-test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fgrep-test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd835f864fa4231c082dedde197d4ed87ed0d070
[INFO] documenting nikomatsakis/grep-test against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fgrep-test" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nikomatsakis/grep-test 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 git repo https://github.com/nikomatsakis/grep-test
[INFO] finished tweaking git repo https://github.com/nikomatsakis/grep-test
[INFO] tweaked toml for git repo https://github.com/nikomatsakis/grep-test written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/nikomatsakis/grep-test already has a lockfile, it will not be regenerated
[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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 4daf1dc76c1ca0116bc1af0722209579644904c599984030efec147a8b0612d7
[INFO] running `Command { std: "docker" "start" "-a" "4daf1dc76c1ca0116bc1af0722209579644904c599984030efec147a8b0612d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4daf1dc76c1ca0116bc1af0722209579644904c599984030efec147a8b0612d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4daf1dc76c1ca0116bc1af0722209579644904c599984030efec147a8b0612d7", kill_on_drop: false }`
[INFO] [stdout] 4daf1dc76c1ca0116bc1af0722209579644904c599984030efec147a8b0612d7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 92e99194a78711dfbadaa298dc8a0681788d2115f282eef5e89139e18d780ba0
[INFO] running `Command { std: "docker" "start" "-a" "92e99194a78711dfbadaa298dc8a0681788d2115f282eef5e89139e18d780ba0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]     Checking backtrace-sys v0.1.16
[INFO] [stderr]     Checking backtrace v0.3.5
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]     Checking failure v0.1.1
[INFO] [stderr]  Documenting grep-test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected identifier, found keyword `extern`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use extern::{
[INFO] [stdout]    |     ^^^^^^ expected identifier, found keyword
[INFO] [stdout]    |
[INFO] [stdout] help: you can escape reserved keywords to use them as identifiers
[INFO] [stdout]    |
[INFO] [stdout] 11 | use r#extern::{
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/main.rs:1:55
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(crate_in_paths, crate_visibility_modifier, extern_in_paths, decl_macro,
[INFO] [stdout]   |                                                       ^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: subsumed by `::foo::bar` paths
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected identifier, found keyword `extern`
[INFO] [stdout]  --> src/file_read.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use extern::std::{fs::File, io::{self, BufRead, BufReader}, path::Path};
[INFO] [stdout]   |     ^^^^^^ expected identifier, found keyword
[INFO] [stdout]   |
[INFO] [stdout] help: you can escape reserved keywords to use them as identifiers
[INFO] [stdout]   |
[INFO] [stdout] 1 | use r#extern::std::{fs::File, io::{self, BufRead, BufReader}, path::Path};
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: maybe a missing crate `r#extern`?
[INFO] [stdout]  --> src/file_read.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use extern::std::{fs::File, io::{self, BufRead, BufReader}, path::Path};
[INFO] [stdout]   |     ^^^^^^ maybe a missing crate `r#extern`?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: maybe a missing crate `r#extern`?
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use extern::{
[INFO] [stdout]    |     ^^^^^^ maybe a missing crate `r#extern`?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `io`
[INFO] [stdout]  --> src/file_read.rs:5:39
[INFO] [stdout]   |
[INFO] [stdout] 5 |     mut callback: impl FnMut(&str) -> io::Result<()>,
[INFO] [stdout]   |                                       ^^ use of undeclared type or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `io`
[INFO] [stdout]  --> src/file_read.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | ) -> io::Result<()> {
[INFO] [stdout]   |      ^^ use of undeclared type or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `io`
[INFO] [stdout]   --> src/main.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn main() -> io::Result<()> {
[INFO] [stdout]    |              ^^ use of undeclared type or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Path` in this scope
[INFO] [stdout]  --> src/file_read.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 |     path: impl AsRef<Path>,
[INFO] [stdout]   |                      ^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::path::Path;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(crate_in_paths, crate_visibility_modifier, extern_in_paths, decl_macro,
[INFO] [stdout] 2 | |            termination_trait, use_nested_groups, universal_impl_trait)]
[INFO] [stdout]   | |_______________________________________________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 11 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0433, E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `grep-test`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name grep_test src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern failure=/opt/rustwide/target/debug/deps/libfailure-87f4aa04bbfa5c37.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-9ba63ac172a8d7e0.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "92e99194a78711dfbadaa298dc8a0681788d2115f282eef5e89139e18d780ba0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92e99194a78711dfbadaa298dc8a0681788d2115f282eef5e89139e18d780ba0", kill_on_drop: false }`
[INFO] [stdout] 92e99194a78711dfbadaa298dc8a0681788d2115f282eef5e89139e18d780ba0