[INFO] cloning repository https://github.com/nikomatsakis/skill-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nikomatsakis/skill-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fskill-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fskill-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0c4f3a5d47cb9bf4fb5cccedb6e959a91b68c086
[INFO] checking nikomatsakis/skill-tree against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikomatsakis%2Fskill-tree" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nikomatsakis/skill-tree on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nikomatsakis/skill-tree
[INFO] finished tweaking git repo https://github.com/nikomatsakis/skill-tree
[INFO] tweaked toml for git repo https://github.com/nikomatsakis/skill-tree written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/nikomatsakis/skill-tree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded markup5ever_rcdom v0.1.0
[INFO] [stderr]   Downloaded xml5ever v0.16.1
[INFO] [stderr]   Downloaded ammonia v3.1.0
[INFO] [stderr]   Downloaded fehler-macros v1.0.0-alpha.2
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[INFO] [stderr]   Downloaded pulldown-cmark v0.7.1
[INFO] [stderr]   Downloaded elasticlunr-rs v2.3.9
[INFO] [stderr]   Downloaded gitignore v1.0.6
[INFO] [stderr]   Downloaded svg v0.5.12
[INFO] [stderr]   Downloaded pulldown-cmark-to-cmark v4.0.2
[INFO] [stderr]   Downloaded htmlescape v0.3.1
[INFO] [stderr]   Downloaded fehler v1.0.0-alpha.2
[INFO] [stderr]   Downloaded toml_edit v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 105d16d128c2373f525fe543c48f463327b129b433446dbbd6425a55c8e52062
[INFO] running `Command { std: "docker" "start" "-a" "105d16d128c2373f525fe543c48f463327b129b433446dbbd6425a55c8e52062", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "105d16d128c2373f525fe543c48f463327b129b433446dbbd6425a55c8e52062", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "105d16d128c2373f525fe543c48f463327b129b433446dbbd6425a55c8e52062", kill_on_drop: false }`
[INFO] [stdout] 105d16d128c2373f525fe543c48f463327b129b433446dbbd6425a55c8e52062
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 33ddec266b3f363ad9e544c74079ade0ff64dd594774e347dda6245e37afd473
[INFO] running `Command { std: "docker" "start" "-a" "33ddec266b3f363ad9e544c74079ade0ff64dd594774e347dda6245e37afd473", kill_on_drop: false }`
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[INFO] [stderr]    Compiling serde_derive v1.0.92
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[INFO] [stderr]    Compiling phf_generator v0.8.0
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[INFO] [stderr]    Compiling string_cache_codegen v0.5.1
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[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling markup5ever v0.10.0
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
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[INFO] [stderr]    Compiling pest_derive v2.1.0
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[INFO] [stderr]    Compiling proc-macro-error v0.4.9
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[INFO] [stderr]     Checking xml5ever v0.16.1
[INFO] [stderr]     Checking elasticlunr-rs v2.3.9
[INFO] [stderr]     Checking pin-project v1.0.7
[INFO] [stderr]     Checking pin-project v0.4.28
[INFO] [stderr]     Checking tracing-futures v0.2.5
[INFO] [stderr]    Compiling structopt-derive v0.4.4
[INFO] [stderr]     Checking tokio-util v0.3.1
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[INFO] [stderr]     Checking ammonia v3.1.0
[INFO] [stderr]     Checking structopt v0.3.11
[INFO] [stderr]     Checking skill-tree v3.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `fontcolor`
[INFO] [stdout]    --> src/graphviz.rs:135:22
[INFO] [stdout]     |
[INFO] [stdout] 135 |         let (_emoji, fontcolor, mut start_tag, mut end_tag) = match item_status {
[INFO] [stdout]     |                      ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fontcolor`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fontcolor`
[INFO] [stdout]    --> src/graphviz.rs:135:22
[INFO] [stdout]     |
[INFO] [stdout] 135 |         let (_emoji, fontcolor, mut start_tag, mut end_tag) = match item_status {
[INFO] [stdout]     |                      ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fontcolor`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking hyper v0.13.10
[INFO] [stderr]     Checking warp v0.2.5
[INFO] [stderr]     Checking mdbook v0.4.8
[INFO] [stderr]     Checking mdbook-skill-tree v3.0.0 (/opt/rustwide/workdir/mdbook-skill-tree)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 51.16s
[INFO] running `Command { std: "docker" "inspect" "33ddec266b3f363ad9e544c74079ade0ff64dd594774e347dda6245e37afd473", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33ddec266b3f363ad9e544c74079ade0ff64dd594774e347dda6245e37afd473", kill_on_drop: false }`
[INFO] [stdout] 33ddec266b3f363ad9e544c74079ade0ff64dd594774e347dda6245e37afd473