[INFO] fetching crate proxy-server 0.2.0...
[INFO] checking proxy-server-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate proxy-server 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate proxy-server 0.2.0 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 proxy-server 0.2.0
[INFO] finished tweaking crates.io crate proxy-server 0.2.0
[INFO] tweaked toml for crates.io crate proxy-server 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate proxy-server 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] face5be14d6088bdd4c46091b6750fe423ed3bfe2d778127336a7b2a9c0d7c91
[INFO] running `Command { std: "docker" "start" "-a" "face5be14d6088bdd4c46091b6750fe423ed3bfe2d778127336a7b2a9c0d7c91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "face5be14d6088bdd4c46091b6750fe423ed3bfe2d778127336a7b2a9c0d7c91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "face5be14d6088bdd4c46091b6750fe423ed3bfe2d778127336a7b2a9c0d7c91", kill_on_drop: false }`
[INFO] [stdout] face5be14d6088bdd4c46091b6750fe423ed3bfe2d778127336a7b2a9c0d7c91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] e4e79ee8cebc3cdc7244654b621a3755112ea0abdd29bf5977abebb06ae70dfc
[INFO] running `Command { std: "docker" "start" "-a" "e4e79ee8cebc3cdc7244654b621a3755112ea0abdd29bf5977abebb06ae70dfc", kill_on_drop: false }`
[INFO] [stderr]     Checking proxy-server v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `check` is never read
[INFO] [stdout]   --> src/prelude/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let mut check: Option<&str> = None;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `check` is never read
[INFO] [stdout]   --> src/prelude/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let mut check: Option<&str> = None;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` 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 0.48s
[INFO] running `Command { std: "docker" "inspect" "e4e79ee8cebc3cdc7244654b621a3755112ea0abdd29bf5977abebb06ae70dfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4e79ee8cebc3cdc7244654b621a3755112ea0abdd29bf5977abebb06ae70dfc", kill_on_drop: false }`
[INFO] [stdout] e4e79ee8cebc3cdc7244654b621a3755112ea0abdd29bf5977abebb06ae70dfc
[INFO] checking proxy-server-0.2.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate proxy-server 0.2.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate proxy-server 0.2.0 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 crates.io crate proxy-server 0.2.0
[INFO] finished tweaking crates.io crate proxy-server 0.2.0
[INFO] tweaked toml for crates.io crate proxy-server 0.2.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate proxy-server 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 702c0bc462a3e240c83c5d625c66eb25e271a943769758626745304259cda7b0
[INFO] running `Command { std: "docker" "start" "-a" "702c0bc462a3e240c83c5d625c66eb25e271a943769758626745304259cda7b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "702c0bc462a3e240c83c5d625c66eb25e271a943769758626745304259cda7b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "702c0bc462a3e240c83c5d625c66eb25e271a943769758626745304259cda7b0", kill_on_drop: false }`
[INFO] [stdout] 702c0bc462a3e240c83c5d625c66eb25e271a943769758626745304259cda7b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] fbd8372bc1695609bb19bb08259eaf1ec426564b3e331c8b04aee2889aa87e61
[INFO] running `Command { std: "docker" "start" "-a" "fbd8372bc1695609bb19bb08259eaf1ec426564b3e331c8b04aee2889aa87e61", kill_on_drop: false }`
[INFO] [stderr]     Checking proxy-server v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `check` is never read
[INFO] [stdout]   --> src/prelude/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let mut check: Option<&str> = None;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `check` is never read
[INFO] [stdout]   --> src/prelude/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let mut check: Option<&str> = None;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` 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 0.41s
[INFO] running `Command { std: "docker" "inspect" "fbd8372bc1695609bb19bb08259eaf1ec426564b3e331c8b04aee2889aa87e61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbd8372bc1695609bb19bb08259eaf1ec426564b3e331c8b04aee2889aa87e61", kill_on_drop: false }`
[INFO] [stdout] fbd8372bc1695609bb19bb08259eaf1ec426564b3e331c8b04aee2889aa87e61