[INFO] cloning repository https://github.com/alpaylan/etna-rs-utils
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alpaylan/etna-rs-utils" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falpaylan%2Fetna-rs-utils", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falpaylan%2Fetna-rs-utils'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 64e8f819d888d83435a74df28959a4f059f01ada
[INFO] checking alpaylan/etna-rs-utils against try#04ea1e1f1a12cfa912c228ca278237d92d0bb6df for pr-148477-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falpaylan%2Fetna-rs-utils" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/alpaylan/etna-rs-utils
[INFO] finished tweaking git repo https://github.com/alpaylan/etna-rs-utils
[INFO] tweaked toml for git repo https://github.com/alpaylan/etna-rs-utils written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/alpaylan/etna-rs-utils on toolchain 04ea1e1f1a12cfa912c228ca278237d92d0bb6df
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+04ea1e1f1a12cfa912c228ca278237d92d0bb6df" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/alpaylan/etna-rs-utils already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+04ea1e1f1a12cfa912c228ca278237d92d0bb6df" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+04ea1e1f1a12cfa912c228ca278237d92d0bb6df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b45e1aad893e4db7027317dad84467c26fb5f23f65c9b6f16f3937e3e9a22409
[INFO] running `Command { std: "docker" "start" "-a" "b45e1aad893e4db7027317dad84467c26fb5f23f65c9b6f16f3937e3e9a22409", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b45e1aad893e4db7027317dad84467c26fb5f23f65c9b6f16f3937e3e9a22409", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b45e1aad893e4db7027317dad84467c26fb5f23f65c9b6f16f3937e3e9a22409", kill_on_drop: false }`
[INFO] [stdout] b45e1aad893e4db7027317dad84467c26fb5f23f65c9b6f16f3937e3e9a22409
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+04ea1e1f1a12cfa912c228ca278237d92d0bb6df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93a95b814c37ae9e0f8c14ba418ca227caef4a147c6d794faf36628636e4e622
[INFO] running `Command { std: "docker" "start" "-a" "93a95b814c37ae9e0f8c14ba418ca227caef4a147c6d794faf36628636e4e622", kill_on_drop: false }`
[INFO] [stderr]     Checking etna-rs-utils v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]   --> src/sampling.rs:26:22
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let result = serde_json::json!({
[INFO] [stdout]    |                      ^^^^^^^^^^ use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]   --> src/sampling.rs:26:22
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let result = serde_json::json!({
[INFO] [stdout]    |                      ^^^^^^^^^^ use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]   --> src/sampling.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             serde_json::to_string(&result)
[INFO] [stdout]    |             ^^^^^^^^^^ use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `serde_json`, use `cargo add serde_json` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]   --> src/sampling.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             serde_json::to_string(&result)
[INFO] [stdout]    |             ^^^^^^^^^^ use of unresolved module or unlinked crate `serde_json`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `serde_json`, use `cargo add serde_json` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/sampling.rs:19:45
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |        ---                                  ^^^^^^^^^^^^^^^^ expected `Result<(), Error>`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] ...
[INFO] [stdout] 47 |         );
[INFO] [stdout]    |          - help: remove this semicolon to return this value
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Result<(), std::fmt::Error>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/sampling.rs:19:45
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
[INFO] [stdout]    |        ---                                  ^^^^^^^^^^^^^^^^ expected `Result<(), Error>`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] ...
[INFO] [stdout] 47 |         );
[INFO] [stdout]    |          - help: remove this semicolon to return this value
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Result<(), std::fmt::Error>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0433.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0433.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `etna-rs-utils` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `etna-rs-utils` (lib test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "93a95b814c37ae9e0f8c14ba418ca227caef4a147c6d794faf36628636e4e622", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93a95b814c37ae9e0f8c14ba418ca227caef4a147c6d794faf36628636e4e622", kill_on_drop: false }`
[INFO] [stdout] 93a95b814c37ae9e0f8c14ba418ca227caef4a147c6d794faf36628636e4e622