[INFO] updating cached repository https://github.com/paulprimus/tail
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/paulprimus/tail
[INFO] [stderr]    dd1197d..093d95a  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 093d95add49bb16b2349630ea70d81050727885f
[INFO] checking paulprimus/tail against master#6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257 for pr-70872
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpaulprimus%2Ftail" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/paulprimus/tail on toolchain 6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/paulprimus/tail
[INFO] finished tweaking git repo https://github.com/paulprimus/tail
[INFO] tweaked toml for git repo https://github.com/paulprimus/tail written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/paulprimus/tail already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+6dee5f1126dfd5c9314ee5ae9d9eb010e35ef257" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7f859d5b2738fd1e13d1c2dfe78f4f28d7893622e1edd1b5a5b696067952498a
[INFO] running `"docker" "start" "-a" "7f859d5b2738fd1e13d1c2dfe78f4f28d7893622e1edd1b5a5b696067952498a"`
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking arc-swap v0.4.5
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]     Checking tokio v0.2.15
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.2.4
[INFO] [stderr]     Checking hyper v0.13.4
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking tail v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/main.rs:151:5
[INFO] [stderr]     |
[INFO] [stderr] 137 | /     loop {
[INFO] [stderr] 138 | |         std::thread::sleep(Duration::from_secs(3));
[INFO] [stderr] 139 | |         cur_seek_pos = reader.seek(SeekFrom::End(0))?;
[INFO] [stderr] 140 | |         if cur_seek_pos > last_seek_pos {
[INFO] [stderr] ...   |
[INFO] [stderr] 149 | |         last_seek_pos = cur_seek_pos;
[INFO] [stderr] 150 | |     }
[INFO] [stderr]     | |_____- any code following this expression is unreachable
[INFO] [stderr] 151 |       Ok(())
[INFO] [stderr]     |       ^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/main.rs:208:13
[INFO] [stderr]     |
[INFO] [stderr] 208 |             _ => {}
[INFO] [stderr]     |             ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num`
[INFO] [stderr]    --> src/main.rs:119:48
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn follow<W: Write>(filename: &str, output: W, num: usize) -> io::Result<()> {
[INFO] [stderr]     |                                                ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `readPage` should have a snake case name
[INFO] [stderr]   --> src/main.rs:82:10
[INFO] [stderr]    |
[INFO] [stderr] 82 | async fn readPage(url: &str) -> Result<(), Box<dyn std::error::Error>>{
[INFO] [stderr]    |          ^^^^^^^^ help: convert the identifier to snake case: `read_page`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     fetch_url(uri).await;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/main.rs:151:5
[INFO] [stderr]     |
[INFO] [stderr] 137 | /     loop {
[INFO] [stderr] 138 | |         std::thread::sleep(Duration::from_secs(3));
[INFO] [stderr] 139 | |         cur_seek_pos = reader.seek(SeekFrom::End(0))?;
[INFO] [stderr] 140 | |         if cur_seek_pos > last_seek_pos {
[INFO] [stderr] ...   |
[INFO] [stderr] 149 | |         last_seek_pos = cur_seek_pos;
[INFO] [stderr] 150 | |     }
[INFO] [stderr]     | |_____- any code following this expression is unreachable
[INFO] [stderr] 151 |       Ok(())
[INFO] [stderr]     |       ^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/main.rs:208:13
[INFO] [stderr]     |
[INFO] [stderr] 208 |             _ => {}
[INFO] [stderr]     |             ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num`
[INFO] [stderr]    --> src/main.rs:119:48
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn follow<W: Write>(filename: &str, output: W, num: usize) -> io::Result<()> {
[INFO] [stderr]     |                                                ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `readPage` should have a snake case name
[INFO] [stderr]   --> src/main.rs:82:10
[INFO] [stderr]    |
[INFO] [stderr] 82 | async fn readPage(url: &str) -> Result<(), Box<dyn std::error::Error>>{
[INFO] [stderr]    |          ^^^^^^^^ help: convert the identifier to snake case: `read_page`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     fetch_url(uri).await;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.00s
[INFO] running `"docker" "inspect" "7f859d5b2738fd1e13d1c2dfe78f4f28d7893622e1edd1b5a5b696067952498a"`
[INFO] running `"docker" "rm" "-f" "7f859d5b2738fd1e13d1c2dfe78f4f28d7893622e1edd1b5a5b696067952498a"`
[INFO] [stdout] 7f859d5b2738fd1e13d1c2dfe78f4f28d7893622e1edd1b5a5b696067952498a