[INFO] cloning repository https://github.com/Mossaka/rusty-xv6
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Mossaka/rusty-xv6" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMossaka%2Frusty-xv6", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMossaka%2Frusty-xv6'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 70dc2da8a58ad2cedacdedacd30254ddcd1a532f
[INFO] checking Mossaka/rusty-xv6 against try#54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47 for pr-153041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMossaka%2Frusty-xv6" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-2-tc2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/Mossaka/rusty-xv6
[INFO] finished tweaking git repo https://github.com/Mossaka/rusty-xv6
[INFO] tweaked toml for git repo https://github.com/Mossaka/rusty-xv6 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Mossaka/rusty-xv6 on toolchain 54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Mossaka/rusty-xv6 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" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c92736472803789841eb1e5acf71434c55d6ce68b1c2cbc64a69cabeac95046a
[INFO] running `Command { std: "docker" "start" "-a" "c92736472803789841eb1e5acf71434c55d6ce68b1c2cbc64a69cabeac95046a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c92736472803789841eb1e5acf71434c55d6ce68b1c2cbc64a69cabeac95046a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c92736472803789841eb1e5acf71434c55d6ce68b1c2cbc64a69cabeac95046a", kill_on_drop: false }`
[INFO] [stdout] c92736472803789841eb1e5acf71434c55d6ce68b1c2cbc64a69cabeac95046a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3fd698eb7a5517578430e27d87424154ffd0720df60ea456fd4e456e452e8b0d
[INFO] running `Command { std: "docker" "start" "-a" "3fd698eb7a5517578430e27d87424154ffd0720df60ea456fd4e456e452e8b0d", kill_on_drop: false }`
[INFO] [stderr]     Checking rusty-risc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `argc`
[INFO] [stdout]   --> src/lib.rs:16:24
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub extern "C" fn main(argc: i32, argv: *const *const u8) -> i32 {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_argc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `argv`
[INFO] [stdout]   --> src/lib.rs:16:35
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub extern "C" fn main(argc: i32, argv: *const *const u8) -> i32 {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_argv`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty-risc` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | / fn panic(_panic: &PanicInfo<'_>) -> ! {
[INFO] [stdout] 7 | |     loop {}
[INFO] [stdout] 8 | | }
[INFO] [stdout]   | |_^
[INFO] [stdout]   |
[INFO] [stdout]   = note: the lang item is first defined in crate `std` (which `test` depends on)
[INFO] [stdout]   = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-957b1fe07cf96b13.rmeta
[INFO] [stdout]   = note: second definition in the local crate (`rusty_risc`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty-risc` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3fd698eb7a5517578430e27d87424154ffd0720df60ea456fd4e456e452e8b0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fd698eb7a5517578430e27d87424154ffd0720df60ea456fd4e456e452e8b0d", kill_on_drop: false }`
[INFO] [stdout] 3fd698eb7a5517578430e27d87424154ffd0720df60ea456fd4e456e452e8b0d