[INFO] cloning repository https://github.com/inko-lang/ivm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/inko-lang/ivm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finko-lang%2Fivm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finko-lang%2Fivm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b452640fbd3c78e79dba00ac96c7741b2eef00c6
[INFO] checking inko-lang/ivm against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finko-lang%2Fivm" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/inko-lang/ivm 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 git repo https://github.com/inko-lang/ivm
[INFO] finished tweaking git repo https://github.com/inko-lang/ivm
[INFO] tweaked toml for git repo https://github.com/inko-lang/ivm written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/inko-lang/ivm 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9c43271f3fb51e1f4a48b62bcea5ba3172929c8408ffbaad9bec982183c52902
[INFO] running `Command { std: "docker" "start" "-a" "9c43271f3fb51e1f4a48b62bcea5ba3172929c8408ffbaad9bec982183c52902", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c43271f3fb51e1f4a48b62bcea5ba3172929c8408ffbaad9bec982183c52902", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c43271f3fb51e1f4a48b62bcea5ba3172929c8408ffbaad9bec982183c52902", kill_on_drop: false }`
[INFO] [stdout] 9c43271f3fb51e1f4a48b62bcea5ba3172929c8408ffbaad9bec982183c52902
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 3264fae82a8452a97112fcf738c1c9ce021cbf9bdee1cb8bff95445ec25c90f0
[INFO] running `Command { std: "docker" "start" "-a" "3264fae82a8452a97112fcf738c1c9ce021cbf9bdee1cb8bff95445ec25c90f0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.149
[INFO] [stderr]     Checking untrusted v0.9.0
[INFO] [stderr]     Checking tinyvec_macros v0.1.1
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]    Compiling rustls v0.21.8
[INFO] [stderr]     Checking unicode-bidi v0.3.13
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking base64 v0.21.5
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]     Checking webpki-roots v0.25.2
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking unicode-normalization v0.1.22
[INFO] [stderr]    Compiling ring v0.17.5
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking filetime v0.2.22
[INFO] [stderr]     Checking xattr v1.0.1
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking idna v0.4.0
[INFO] [stderr]     Checking url v2.4.1
[INFO] [stderr]     Checking sct v0.7.1
[INFO] [stderr]     Checking rustls-webpki v0.101.7
[INFO] [stderr]     Checking ureq v2.8.0
[INFO] [stderr]     Checking ivm v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ureq` is imported redundantly
[INFO] [stdout]  --> src/http.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ureq::{self, Agent, Error as HttpError, Response};
[INFO] [stdout]   |            ^^^^ the item `ureq` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ureq` is imported redundantly
[INFO] [stdout]  --> src/http.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ureq::{self, Agent, Error as HttpError, Response};
[INFO] [stdout]   |            ^^^^ the item `ureq` is already defined by prelude
[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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.27s
[INFO] running `Command { std: "docker" "inspect" "3264fae82a8452a97112fcf738c1c9ce021cbf9bdee1cb8bff95445ec25c90f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3264fae82a8452a97112fcf738c1c9ce021cbf9bdee1cb8bff95445ec25c90f0", kill_on_drop: false }`
[INFO] [stdout] 3264fae82a8452a97112fcf738c1c9ce021cbf9bdee1cb8bff95445ec25c90f0
[INFO] checking inko-lang/ivm against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finko-lang%2Fivm" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/inko-lang/ivm on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/inko-lang/ivm
[INFO] finished tweaking git repo https://github.com/inko-lang/ivm
[INFO] tweaked toml for git repo https://github.com/inko-lang/ivm written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/inko-lang/ivm 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ac7eebc74367332a52c3f568dd73d836573dfa1d618920d9f5c0c796bb2a3b5
[INFO] running `Command { std: "docker" "start" "-a" "6ac7eebc74367332a52c3f568dd73d836573dfa1d618920d9f5c0c796bb2a3b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ac7eebc74367332a52c3f568dd73d836573dfa1d618920d9f5c0c796bb2a3b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ac7eebc74367332a52c3f568dd73d836573dfa1d618920d9f5c0c796bb2a3b5", kill_on_drop: false }`
[INFO] [stdout] 6ac7eebc74367332a52c3f568dd73d836573dfa1d618920d9f5c0c796bb2a3b5
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5e5ef03a5bedaee68b33ade65b02b087db97d223256b326550db1d6acfeb5ffe
[INFO] running `Command { std: "docker" "start" "-a" "5e5ef03a5bedaee68b33ade65b02b087db97d223256b326550db1d6acfeb5ffe", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.149
[INFO] [stderr]     Checking tinyvec_macros v0.1.1
[INFO] [stderr]     Checking untrusted v0.9.0
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking unicode-bidi v0.3.13
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]    Compiling rustls v0.21.8
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]     Checking webpki-roots v0.25.2
[INFO] [stderr]     Checking base64 v0.21.5
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling ring v0.17.5
[INFO] [stderr]     Checking unicode-normalization v0.1.22
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking xattr v1.0.1
[INFO] [stderr]     Checking filetime v0.2.22
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking idna v0.4.0
[INFO] [stderr]     Checking url v2.4.1
[INFO] [stderr]     Checking sct v0.7.1
[INFO] [stderr]     Checking rustls-webpki v0.101.7
[INFO] [stderr]     Checking ureq v2.8.0
[INFO] [stderr]     Checking ivm v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ureq` is imported redundantly
[INFO] [stdout]  --> src/http.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ureq::{self, Agent, Error as HttpError, Response};
[INFO] [stdout]   |            ^^^^ the item `ureq` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ureq` is imported redundantly
[INFO] [stdout]  --> src/http.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ureq::{self, Agent, Error as HttpError, Response};
[INFO] [stdout]   |            ^^^^ the item `ureq` is already defined by prelude
[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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.06s
[INFO] running `Command { std: "docker" "inspect" "5e5ef03a5bedaee68b33ade65b02b087db97d223256b326550db1d6acfeb5ffe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e5ef03a5bedaee68b33ade65b02b087db97d223256b326550db1d6acfeb5ffe", kill_on_drop: false }`
[INFO] [stdout] 5e5ef03a5bedaee68b33ade65b02b087db97d223256b326550db1d6acfeb5ffe