[INFO] fetching crate libherokubuildpack 0.16.0...
[INFO] checking libherokubuildpack-0.16.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate libherokubuildpack 0.16.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate libherokubuildpack 0.16.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libherokubuildpack 0.16.0
[INFO] finished tweaking crates.io crate libherokubuildpack 0.16.0
[INFO] tweaked toml for crates.io crate libherokubuildpack 0.16.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 106 packages
[INFO] [stderr]       Adding base64 v0.21.7 (latest: v0.22.0)
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding fancy-regex v0.12.0 (latest: v0.13.0)
[INFO] [stderr]       Adding generic-array v0.14.7 (latest: v1.0.0)
[INFO] [stderr]       Adding libcnb v0.16.0 (latest: v0.19.0)
[INFO] [stderr]       Adding libcnb-common v0.16.0 (latest: v0.19.0)
[INFO] [stderr]       Adding libcnb-data v0.16.0 (latest: v0.19.0)
[INFO] [stderr]       Adding libcnb-proc-macros v0.16.0 (latest: v0.19.0)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding rustls v0.22.3 (latest: v0.23.4)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libcnb-proc-macros v0.16.0
[INFO] [stderr]   Downloaded libcnb-common v0.16.0
[INFO] [stderr]   Downloaded libcnb-data v0.16.0
[INFO] [stderr]   Downloaded libcnb v0.16.0
[INFO] [stderr]   Downloaded cargo_metadata v0.18.1
[INFO] [stderr]   Downloaded fancy-regex v0.12.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 35af03142fd74d726a0bb5e1ede4a8baa11823ae2b0440f639817f1bae2d4a23
[INFO] running `Command { std: "docker" "start" "-a" "35af03142fd74d726a0bb5e1ede4a8baa11823ae2b0440f639817f1bae2d4a23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35af03142fd74d726a0bb5e1ede4a8baa11823ae2b0440f639817f1bae2d4a23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35af03142fd74d726a0bb5e1ede4a8baa11823ae2b0440f639817f1bae2d4a23", kill_on_drop: false }`
[INFO] [stdout] 35af03142fd74d726a0bb5e1ede4a8baa11823ae2b0440f639817f1bae2d4a23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 86f33995b10d0a44a6e8791a176a4ea7c0cd0dcf6f040a147086f4d1da188e0e
[INFO] running `Command { std: "docker" "start" "-a" "86f33995b10d0a44a6e8791a176a4ea7c0cd0dcf6f040a147086f4d1da188e0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.22
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]    Compiling camino v1.1.6
[INFO] [stderr]    Compiling regex-automata v0.4.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]     Checking serde_spanned v0.6.5
[INFO] [stderr]     Checking toml_datetime v0.6.5
[INFO] [stderr]     Checking winnow v0.6.5
[INFO] [stderr]    Compiling itoa v1.0.11
[INFO] [stderr]    Compiling ryu v1.0.17
[INFO] [stderr]    Compiling bit-set v0.5.3
[INFO] [stderr]     Checking rustls-webpki v0.102.2
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking webpki-roots v0.26.1
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking pathdiff v0.2.1
[INFO] [stderr]     Checking rustls v0.22.3
[INFO] [stderr]    Compiling thiserror v1.0.58
[INFO] [stderr]    Compiling regex v1.10.4
[INFO] [stderr]     Checking toml_edit v0.22.9
[INFO] [stderr]     Checking fancy-regex v0.12.0
[INFO] [stderr]     Checking ureq v2.9.6
[INFO] [stderr]    Compiling cargo-platform v0.1.8
[INFO] [stderr]     Checking toml v0.8.12
[INFO] [stderr]     Checking libcnb-common v0.16.0
[INFO] [stderr]    Compiling cargo_metadata v0.18.1
[INFO] [stderr]    Compiling libcnb-proc-macros v0.16.0
[INFO] [stderr]     Checking libcnb-data v0.16.0
[INFO] [stderr]     Checking libcnb v0.16.0
[INFO] [stderr]     Checking libherokubuildpack v0.16.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `fs` is imported redundantly
[INFO] [stdout]   --> src/fs.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     use std::fs;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     use super::*;
[INFO] [stdout]    |         -------- the item `fs` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.91s
[INFO] running `Command { std: "docker" "inspect" "86f33995b10d0a44a6e8791a176a4ea7c0cd0dcf6f040a147086f4d1da188e0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86f33995b10d0a44a6e8791a176a4ea7c0cd0dcf6f040a147086f4d1da188e0e", kill_on_drop: false }`
[INFO] [stdout] 86f33995b10d0a44a6e8791a176a4ea7c0cd0dcf6f040a147086f4d1da188e0e
[INFO] checking libherokubuildpack-0.16.0 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate libherokubuildpack 0.16.0 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate libherokubuildpack 0.16.0 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libherokubuildpack 0.16.0
[INFO] finished tweaking crates.io crate libherokubuildpack 0.16.0
[INFO] tweaked toml for crates.io crate libherokubuildpack 0.16.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0dcf783d6ab8957ebefd029d9e8221412e76f6005aad038bec49e1ed2d4f6b45
[INFO] running `Command { std: "docker" "start" "-a" "0dcf783d6ab8957ebefd029d9e8221412e76f6005aad038bec49e1ed2d4f6b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0dcf783d6ab8957ebefd029d9e8221412e76f6005aad038bec49e1ed2d4f6b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0dcf783d6ab8957ebefd029d9e8221412e76f6005aad038bec49e1ed2d4f6b45", kill_on_drop: false }`
[INFO] [stdout] 0dcf783d6ab8957ebefd029d9e8221412e76f6005aad038bec49e1ed2d4f6b45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25001fa030883d95a45323cf8d4bc167b982d3e151ea07d50a21fa3e6294b24b
[INFO] running `Command { std: "docker" "start" "-a" "25001fa030883d95a45323cf8d4bc167b982d3e151ea07d50a21fa3e6294b24b", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]    Compiling camino v1.1.6
[INFO] [stderr]    Compiling semver v1.0.22
[INFO] [stderr]    Compiling regex-automata v0.4.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking serde_spanned v0.6.5
[INFO] [stderr]     Checking toml_datetime v0.6.5
[INFO] [stderr]    Compiling ryu v1.0.17
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling itoa v1.0.11
[INFO] [stderr]     Checking winnow v0.6.5
[INFO] [stderr]    Compiling bit-set v0.5.3
[INFO] [stderr]    Compiling libz-sys v1.1.16
[INFO] [stderr]     Checking rustls-webpki v0.102.2
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking webpki-roots v0.26.1
[INFO] [stderr]     Checking rustls v0.22.3
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking pathdiff v0.2.1
[INFO] [stderr]     Checking toml_edit v0.22.9
[INFO] [stderr]    Compiling thiserror v1.0.58
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking fancy-regex v0.12.0
[INFO] [stderr]     Checking ureq v2.9.6
[INFO] [stderr]    Compiling cargo-platform v0.1.8
[INFO] [stderr]     Checking toml v0.8.12
[INFO] [stderr]     Checking libcnb-common v0.16.0
[INFO] [stderr]    Compiling cargo_metadata v0.18.1
[INFO] [stderr]    Compiling libcnb-proc-macros v0.16.0
[INFO] [stderr]     Checking libcnb-data v0.16.0
[INFO] [stderr]     Checking libcnb v0.16.0
[INFO] [stderr]     Checking libherokubuildpack v0.16.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `fs` is imported redundantly
[INFO] [stdout]   --> src/fs.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     use std::fs;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     use super::*;
[INFO] [stdout]    |         -------- the item `fs` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 27.50s
[INFO] running `Command { std: "docker" "inspect" "25001fa030883d95a45323cf8d4bc167b982d3e151ea07d50a21fa3e6294b24b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25001fa030883d95a45323cf8d4bc167b982d3e151ea07d50a21fa3e6294b24b", kill_on_drop: false }`
[INFO] [stdout] 25001fa030883d95a45323cf8d4bc167b982d3e151ea07d50a21fa3e6294b24b