[INFO] fetching crate randlib 0.2.0...
[INFO] checking randlib-0.2.0 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate randlib 0.2.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate randlib 0.2.0
[INFO] finished tweaking crates.io crate randlib 0.2.0
[INFO] tweaked toml for crates.io crate randlib 0.2.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate randlib 0.2.0 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate randlib 0.2.0 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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c13b01ebcd7d9a90bc4af21b99a8c8a473217bcd6d4ca0ed932f15d14409118f
[INFO] running `Command { std: "docker" "start" "-a" "c13b01ebcd7d9a90bc4af21b99a8c8a473217bcd6d4ca0ed932f15d14409118f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c13b01ebcd7d9a90bc4af21b99a8c8a473217bcd6d4ca0ed932f15d14409118f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c13b01ebcd7d9a90bc4af21b99a8c8a473217bcd6d4ca0ed932f15d14409118f", kill_on_drop: false }`
[INFO] [stdout] c13b01ebcd7d9a90bc4af21b99a8c8a473217bcd6d4ca0ed932f15d14409118f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9795c8aacdb40b5c980d1a4f0fa02697b06c4e28ca1288eba5b04b24aa54b02
[INFO] running `Command { std: "docker" "start" "-a" "b9795c8aacdb40b5c980d1a4f0fa02697b06c4e28ca1288eba5b04b24aa54b02", kill_on_drop: false }`
[INFO] [stderr]     Checking randlib v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:339:33
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub fn rand_element<'a, T>(&'a mut self, vector: &'a Vec<T>) -> &T {
[INFO] [stdout]     |                                 ^^                    ^^            -- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                                 |                     |
[INFO] [stdout]     |                                 |                     these lifetimes flow to the output
[INFO] [stdout]     |                                 these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub fn rand_element<'a, T>(&'a mut self, vector: &'a Vec<T>) -> &'a T {
[INFO] [stdout]     |                                                                      ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:339:33
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub fn rand_element<'a, T>(&'a mut self, vector: &'a Vec<T>) -> &T {
[INFO] [stdout]     |                                 ^^                    ^^            -- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                                 |                     |
[INFO] [stdout]     |                                 |                     these lifetimes flow to the output
[INFO] [stdout]     |                                 these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub fn rand_element<'a, T>(&'a mut self, vector: &'a Vec<T>) -> &'a T {
[INFO] [stdout]     |                                                                      ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "b9795c8aacdb40b5c980d1a4f0fa02697b06c4e28ca1288eba5b04b24aa54b02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9795c8aacdb40b5c980d1a4f0fa02697b06c4e28ca1288eba5b04b24aa54b02", kill_on_drop: false }`
[INFO] [stdout] b9795c8aacdb40b5c980d1a4f0fa02697b06c4e28ca1288eba5b04b24aa54b02