[INFO] fetching crate mnemos-userspace 0.1.0...
[INFO] testing mnemos-userspace-0.1.0 against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] extracting crate mnemos-userspace 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] removed /workspace/builds/worker-7-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate mnemos-userspace 0.1.0
[INFO] finished tweaking crates.io crate mnemos-userspace 0.1.0
[INFO] tweaked toml for crates.io crate mnemos-userspace 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mnemos-userspace 0.1.0 on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mnemos-userspace 0.1.0 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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded postcard-cobs v0.1.5-pre
[INFO] [stderr]   Downloaded nb v1.0.0
[INFO] [stderr]   Downloaded critical-section v0.2.7
[INFO] [stderr]   Downloaded mnemos-common v0.1.0
[INFO] [stderr]   Downloaded atomic-polyfill v0.1.8
[INFO] [stderr]   Downloaded heapless v0.7.10
[INFO] [stderr]   Downloaded postcard v0.7.3
[INFO] [stderr]   Downloaded riscv v0.7.0
[INFO] [stderr]   Downloaded cortex-m v0.7.4
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b2eb3c60b761549d9d4ce0c71aecc096e16070802e30bab8a60e7b589ff3379
[INFO] running `Command { std: "docker" "start" "-a" "7b2eb3c60b761549d9d4ce0c71aecc096e16070802e30bab8a60e7b589ff3379", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b2eb3c60b761549d9d4ce0c71aecc096e16070802e30bab8a60e7b589ff3379", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b2eb3c60b761549d9d4ce0c71aecc096e16070802e30bab8a60e7b589ff3379", kill_on_drop: false }`
[INFO] [stdout] 7b2eb3c60b761549d9d4ce0c71aecc096e16070802e30bab8a60e7b589ff3379
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 8381b0616180f4fe9da5104b4bbea59e94fa79cc5b588ccd9f1c3595303d823f
[INFO] running `Command { std: "docker" "start" "-a" "8381b0616180f4fe9da5104b4bbea59e94fa79cc5b588ccd9f1c3595303d823f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling heapless v0.7.10
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling postcard-cobs v0.1.5-pre
[INFO] [stderr]    Compiling hash32 v0.2.1
[INFO] [stderr]    Compiling mnemos-userspace v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling postcard v0.7.3
[INFO] [stderr]    Compiling mnemos-common v0.1.0
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/lib.rs:7:1
[INFO] [stdout]    |
[INFO] [stdout] 7  |   /// The user must provide a `no_mangle` entrypoint.
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 8  | / extern "Rust" {
[INFO] [stdout] 9  | |     fn entry() -> !;
[INFO] [stdout] 10 | | }
[INFO] [stdout]    | |_- rustdoc does not generate documentation for extern blocks
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[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] [stderr] error: could not compile `mnemos-userspace` (bin "mnemos-userspace") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "8381b0616180f4fe9da5104b4bbea59e94fa79cc5b588ccd9f1c3595303d823f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8381b0616180f4fe9da5104b4bbea59e94fa79cc5b588ccd9f1c3595303d823f", kill_on_drop: false }`
[INFO] [stdout] 8381b0616180f4fe9da5104b4bbea59e94fa79cc5b588ccd9f1c3595303d823f