[INFO] fetching crate custom-string 0.2.0...
[INFO] checking custom-string-0.2.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate custom-string 0.2.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate custom-string 0.2.0
[INFO] finished tweaking crates.io crate custom-string 0.2.0
[INFO] tweaked toml for crates.io crate custom-string 0.2.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate custom-string 0.2.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate custom-string 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44f5570cd13414a1c55e0286a5bbabba1f641690a037fe7b45a7c59db56ac91e
[INFO] running `Command { std: "docker" "start" "-a" "44f5570cd13414a1c55e0286a5bbabba1f641690a037fe7b45a7c59db56ac91e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44f5570cd13414a1c55e0286a5bbabba1f641690a037fe7b45a7c59db56ac91e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44f5570cd13414a1c55e0286a5bbabba1f641690a037fe7b45a7c59db56ac91e", kill_on_drop: false }`
[INFO] [stdout] 44f5570cd13414a1c55e0286a5bbabba1f641690a037fe7b45a7c59db56ac91e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd947f92a53b6d6b739cba1dbb900c08c51b1176610233855a828097168cd46e
[INFO] running `Command { std: "docker" "start" "-a" "fd947f92a53b6d6b739cba1dbb900c08c51b1176610233855a828097168cd46e", kill_on_drop: false }`
[INFO] [stderr]     Checking custom-string 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:162:27
[INFO] [stdout]     |
[INFO] [stdout] 162 |               pub fn to_ref(&self) -> $ref_struct_name {
[INFO] [stdout]     |                             ^^^^^     ---------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             this lifetime flows to the output
[INFO] [stdout] ...
[INFO] [stdout] 235 | /     custom_string!(#[doc = "A lowercase string."], Lower, LowerRef, |s: &str| if !s
[INFO] [stdout] 236 | |         .as_bytes()
[INFO] [stdout] 237 | |         .iter()
[INFO] [stdout] 238 | |         .all(|c| c.is_ascii_lowercase())
[INFO] [stdout] ...   |
[INFO] [stdout] 242 | |         Ok(())
[INFO] [stdout] 243 | |     });
[INFO] [stdout]     | |______- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `custom_string` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 162 |             pub fn to_ref(&self) -> $ref_struct_name<'_> {
[INFO] [stdout]     |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "fd947f92a53b6d6b739cba1dbb900c08c51b1176610233855a828097168cd46e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd947f92a53b6d6b739cba1dbb900c08c51b1176610233855a828097168cd46e", kill_on_drop: false }`
[INFO] [stdout] fd947f92a53b6d6b739cba1dbb900c08c51b1176610233855a828097168cd46e