[INFO] fetching crate cueball 0.3.5...
[INFO] checking cueball-0.3.5 against master#dc375db7d8df0aa450e622c529147c95eee756f5 for pr-156749
[INFO] extracting crate cueball 0.3.5 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate cueball 0.3.5
[INFO] finished tweaking crates.io crate cueball 0.3.5
[INFO] tweaked toml for crates.io crate cueball 0.3.5 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate cueball 0.3.5 on toolchain dc375db7d8df0aa450e622c529147c95eee756f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate cueball 0.3.5 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" "+dc375db7d8df0aa450e622c529147c95eee756f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slog-stdlog v3.0.5
[INFO] [stderr]   Downloaded hermit-abi v0.1.12
[INFO] [stderr]   Downloaded slog-term v2.5.0
[INFO] [stderr]   Downloaded term v0.6.1
[INFO] [stderr]   Downloaded slog v2.5.2
[INFO] [stderr]   Downloaded arc-swap v0.4.6
[INFO] [stderr]   Downloaded instant v0.1.3
[INFO] [stderr]   Downloaded crossbeam v0.2.12
[INFO] [stderr]   Downloaded derive_more v0.14.1
[INFO] [stderr]   Downloaded backoff v0.1.6
[INFO] [stderr]   Downloaded slog-scope v4.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391
[INFO] running `Command { std: "docker" "start" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]     Checking arc-swap v0.4.6
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]     Checking instant v0.1.3
[INFO] [stderr]     Checking backoff v0.1.6
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]    Compiling derive_more v0.14.1
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking slog-scope v4.3.0
[INFO] [stderr]     Checking slog-stdlog v3.0.5
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking timer v0.2.0
[INFO] [stderr]     Checking slog-term v2.5.0
[INFO] [stderr]     Checking cueball v0.3.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/connection_pool.rs:530:13
[INFO] [stdout]     |
[INFO] [stdout] 530 |         let mut connection_data = connection_data_guard.deref_mut();
[INFO] [stdout]     |             ----^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/connection_pool/types.rs:195:33
[INFO] [stdout]     |
[INFO] [stdout] 195 |     pub fn connection_data_lock(&self) -> MutexGuard<ConnectionData<C>> {
[INFO] [stdout]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 195 |     pub fn connection_data_lock(&self) -> MutexGuard<'_, ConnectionData<C>> {
[INFO] [stdout]     |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/connection_pool/types.rs:249:21
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn get_lock(&self) -> MutexGuard<bool> {
[INFO] [stdout]     |                     ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn get_lock(&self) -> MutexGuard<'_, bool> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `addr` is never read
[INFO] [stdout]   --> tests/basic_test.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct DummyConnection {
[INFO] [stdout]    |            --------------- field in this struct
[INFO] [stdout] 23 |     addr: SocketAddr,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DummyConnection` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `addr` is never read
[INFO] [stdout]   --> examples/basic.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct DummyConnection {
[INFO] [stdout]    |            --------------- field in this struct
[INFO] [stdout] 23 |     addr: SocketAddr,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DummyConnection` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/connection_pool.rs:530:13
[INFO] [stdout]     |
[INFO] [stdout] 530 |         let mut connection_data = connection_data_guard.deref_mut();
[INFO] [stdout]     |             ----^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/connection_pool/types.rs:195:33
[INFO] [stdout]     |
[INFO] [stdout] 195 |     pub fn connection_data_lock(&self) -> MutexGuard<ConnectionData<C>> {
[INFO] [stdout]     |                                 ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                 |
[INFO] [stdout]     |                                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 195 |     pub fn connection_data_lock(&self) -> MutexGuard<'_, ConnectionData<C>> {
[INFO] [stdout]     |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/connection_pool/types.rs:249:21
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn get_lock(&self) -> MutexGuard<bool> {
[INFO] [stdout]     |                     ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub fn get_lock(&self) -> MutexGuard<'_, bool> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.73s
[INFO] running `Command { std: "docker" "inspect" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391", kill_on_drop: false }`
[INFO] [stdout] 9808ae0b12a5c002e3072716d247ff7fe0e5d92cfd372d38615be0df7f12c391
