[INFO] cloning repository https://github.com/LucianoBestia/unsafe_features_example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LucianoBestia/unsafe_features_example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLucianoBestia%2Funsafe_features_example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLucianoBestia%2Funsafe_features_example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1a3fa7f3761db17360af8cadfc1cb4bae14b5a22
[INFO] checking LucianoBestia/unsafe_features_example against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLucianoBestia%2Funsafe_features_example" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LucianoBestia/unsafe_features_example on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LucianoBestia/unsafe_features_example
[INFO] finished tweaking git repo https://github.com/LucianoBestia/unsafe_features_example
[INFO] tweaked toml for git repo https://github.com/LucianoBestia/unsafe_features_example written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/LucianoBestia/unsafe_features_example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 856aeb18f75943f59c35f6a6549f2be4b5b3ecd404e508178eb0fb855221a563
[INFO] running `Command { std: "docker" "start" "-a" "856aeb18f75943f59c35f6a6549f2be4b5b3ecd404e508178eb0fb855221a563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "856aeb18f75943f59c35f6a6549f2be4b5b3ecd404e508178eb0fb855221a563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "856aeb18f75943f59c35f6a6549f2be4b5b3ecd404e508178eb0fb855221a563", kill_on_drop: false }`
[INFO] [stdout] 856aeb18f75943f59c35f6a6549f2be4b5b3ecd404e508178eb0fb855221a563
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1fdb3f88e6ba1c0fb5109bb9560f29ff23be2e405373c9c93e3545fe12a60741
[INFO] running `Command { std: "docker" "start" "-a" "1fdb3f88e6ba1c0fb5109bb9560f29ff23be2e405373c9c93e3545fe12a60741", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking library v0.0.1 (/opt/rustwide/workdir/library)
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> library/src/read_lyrics_mod.rs:5:13
[INFO] [stdout]    |
[INFO] [stdout] 5  | /             /// every unsafe should have a doc-comment, to describe what it does
[INFO] [stdout] 6  | |             /// this unsafe reads from "sample_data/songs/basket_case_green_day.txt"
[INFO] [stdout] 7  | |             /// one idea how to force the existence of "unsafe feature"
[INFO] [stdout] 8  | |             ///    unsafe( "unsafe_feature_read_song"){...}
[INFO] [stdout]    | |___________________________________________________________^
[INFO] [stdout] 9  | /             unsafe{
[INFO] [stdout] 10 | |                 let path = "sample_data/songs/basket_case_green_day.txt";
[INFO] [stdout] 11 | |                 // std::fs should be "unsafe"
[INFO] [stdout] 12 | |                 // therefore the code must be under a namespace of "unsafe features"
[INFO] [stdout] 13 | |                 file_content = std::fs::read_to_string(path).unwrap();
[INFO] [stdout] 14 | |             }
[INFO] [stdout]    | |_____________- rustdoc does not generate documentation for expressions
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]  --> library/src/read_lyrics_mod.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |             unsafe{
[INFO] [stdout]   |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_private_key`
[INFO] [stdout]   --> library/src/read_private_key_mod.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn read_private_key()->String {"no feature, no access.".to_string()}
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking client1 v0.0.1 (/opt/rustwide/workdir/client1)
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> library/src/read_lyrics_mod.rs:5:13
[INFO] [stdout]    |
[INFO] [stdout] 5  | /             /// every unsafe should have a doc-comment, to describe what it does
[INFO] [stdout] 6  | |             /// this unsafe reads from "sample_data/songs/basket_case_green_day.txt"
[INFO] [stdout] 7  | |             /// one idea how to force the existence of "unsafe feature"
[INFO] [stdout] 8  | |             ///    unsafe( "unsafe_feature_read_song"){...}
[INFO] [stdout]    | |___________________________________________________________^
[INFO] [stdout] 9  | /             unsafe{
[INFO] [stdout] 10 | |                 let path = "sample_data/songs/basket_case_green_day.txt";
[INFO] [stdout] 11 | |                 // std::fs should be "unsafe"
[INFO] [stdout] 12 | |                 // therefore the code must be under a namespace of "unsafe features"
[INFO] [stdout] 13 | |                 file_content = std::fs::read_to_string(path).unwrap();
[INFO] [stdout] 14 | |             }
[INFO] [stdout]    | |_____________- rustdoc does not generate documentation for expressions
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]  --> library/src/read_lyrics_mod.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |             unsafe{
[INFO] [stdout]   |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_private_key`
[INFO] [stdout]   --> library/src/read_private_key_mod.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn read_private_key()->String {"no feature, no access.".to_string()}
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "1fdb3f88e6ba1c0fb5109bb9560f29ff23be2e405373c9c93e3545fe12a60741", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fdb3f88e6ba1c0fb5109bb9560f29ff23be2e405373c9c93e3545fe12a60741", kill_on_drop: false }`
[INFO] [stdout] 1fdb3f88e6ba1c0fb5109bb9560f29ff23be2e405373c9c93e3545fe12a60741