[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] testing LucianoBestia/unsafe_features_example against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLucianoBestia%2Funsafe_features_example" "/workspace/builds/worker-67/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-67/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LucianoBestia/unsafe_features_example on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-67/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" "+1.55.0" "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-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8d82c5cd60763c1674451cfe03430424a55f15b4b38fecda15723eb4860ee8f
[INFO] running `Command { std: "docker" "start" "-a" "c8d82c5cd60763c1674451cfe03430424a55f15b4b38fecda15723eb4860ee8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8d82c5cd60763c1674451cfe03430424a55f15b4b38fecda15723eb4860ee8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8d82c5cd60763c1674451cfe03430424a55f15b4b38fecda15723eb4860ee8f", kill_on_drop: false }`
[INFO] [stdout] c8d82c5cd60763c1674451cfe03430424a55f15b4b38fecda15723eb4860ee8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] df38f6b607c263c6cc61a91bb6cc05b64259135d8da1276ac58bfc808a0ed732
[INFO] running `Command { std: "docker" "start" "-a" "df38f6b607c263c6cc61a91bb6cc05b64259135d8da1276ac58bfc808a0ed732", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling client1 v0.0.1 (/opt/rustwide/workdir/client1)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.07s
[INFO] running `Command { std: "docker" "inspect" "df38f6b607c263c6cc61a91bb6cc05b64259135d8da1276ac58bfc808a0ed732", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df38f6b607c263c6cc61a91bb6cc05b64259135d8da1276ac58bfc808a0ed732", kill_on_drop: false }`
[INFO] [stdout] df38f6b607c263c6cc61a91bb6cc05b64259135d8da1276ac58bfc808a0ed732
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ea82bb27298abdcfbabf70699c7a5835dd55440138deacad0fb26b49182ced3
[INFO] running `Command { std: "docker" "start" "-a" "2ea82bb27298abdcfbabf70699c7a5835dd55440138deacad0fb26b49182ced3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]    Compiling library v0.0.1 (/opt/rustwide/workdir/library)
[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] [stderr]    Compiling client1 v0.0.1 (/opt/rustwide/workdir/client1)
[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] [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 test [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "2ea82bb27298abdcfbabf70699c7a5835dd55440138deacad0fb26b49182ced3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ea82bb27298abdcfbabf70699c7a5835dd55440138deacad0fb26b49182ced3", kill_on_drop: false }`
[INFO] [stdout] 2ea82bb27298abdcfbabf70699c7a5835dd55440138deacad0fb26b49182ced3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6dd988ddea4f1ad616704b1c03a36969ad20939f6f627dcecee9285c78eea578
[INFO] running `Command { std: "docker" "start" "-a" "6dd988ddea4f1ad616704b1c03a36969ad20939f6f627dcecee9285c78eea578", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> library/src/read_lyrics_mod.rs:5:13
[INFO] [stderr]    |
[INFO] [stderr] 5  | /             /// every unsafe should have a doc-comment, to describe what it does
[INFO] [stderr] 6  | |             /// this unsafe reads from "sample_data/songs/basket_case_green_day.txt"
[INFO] [stderr] 7  | |             /// one idea how to force the existence of "unsafe feature"
[INFO] [stderr] 8  | |             ///    unsafe( "unsafe_feature_read_song"){...}
[INFO] [stderr]    | |___________________________________________________________^
[INFO] [stderr] 9  | /             unsafe{
[INFO] [stderr] 10 | |                 let path = "sample_data/songs/basket_case_green_day.txt";
[INFO] [stderr] 11 | |                 // std::fs should be "unsafe"
[INFO] [stderr] 12 | |                 // therefore the code must be under a namespace of "unsafe features"
[INFO] [stderr] 13 | |                 file_content = std::fs::read_to_string(path).unwrap();
[INFO] [stderr] 14 | |             }
[INFO] [stderr]    | |_____________- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]  --> library/src/read_lyrics_mod.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |             unsafe{
[INFO] [stderr]   |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_private_key`
[INFO] [stderr]   --> library/src/read_private_key_mod.rs:20:16
[INFO] [stderr]    |
[INFO] [stderr] 20 |         pub fn read_private_key()->String {"no feature, no access.".to_string()}
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `library` (lib) generated 3 warnings
[INFO] [stderr] warning: `library` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.27s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/client1-4ed44fc6d501c62f)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/library-0c23673f1d488904)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests library
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6dd988ddea4f1ad616704b1c03a36969ad20939f6f627dcecee9285c78eea578", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd988ddea4f1ad616704b1c03a36969ad20939f6f627dcecee9285c78eea578", kill_on_drop: false }`
[INFO] [stdout] 6dd988ddea4f1ad616704b1c03a36969ad20939f6f627dcecee9285c78eea578