[INFO] fetching crate mango-os 0.2.1...
[INFO] checking mango-os-0.2.1 against 1.95.0 for pr-155915
[INFO] extracting crate mango-os 0.2.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate mango-os 0.2.1
[INFO] finished tweaking crates.io crate mango-os 0.2.1
[INFO] tweaked toml for crates.io crate mango-os 0.2.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mango-os 0.2.1 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 41 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded aarch64-cpu v9.4.0
[INFO] [stderr]   Downloaded mango-rt v0.2.1
[INFO] [stderr]   Downloaded mango-test v0.2.1
[INFO] [stderr]   Downloaded mango-core v0.2.1
[INFO] [stderr]   Downloaded mango_aarch64 v0.2.1
[INFO] [stderr]   Downloaded pic8259 v0.11.0
[INFO] [stderr]   Downloaded tock-registers v0.8.1
[INFO] [stderr]   Downloaded mango-hal v0.2.1
[INFO] [stderr]   Downloaded mango-boot v0.2.1
[INFO] [stderr]   Downloaded linked_list_allocator v0.10.6
[INFO] [stderr]   Downloaded volatile v0.3.0
[INFO] [stderr]   Downloaded const_fn v0.4.12
[INFO] [stderr]   Downloaded conquer-util v0.3.0
[INFO] [stderr]   Downloaded conquer-once v0.4.0
[INFO] [stderr]   Downloaded bootloader v0.9.34
[INFO] [stderr]   Downloaded spinning_top v0.2.5
[INFO] [stderr]   Downloaded uart_16550 v0.3.2
[INFO] [stderr]   Downloaded volatile v0.4.6
[INFO] [stderr]   Downloaded x86_64 v0.15.4
[INFO] [stderr]   Downloaded raw-cpuid v10.7.0
[INFO] [stderr]   Downloaded qemu-exit v3.0.2
[INFO] [stderr]   Downloaded x86 v0.52.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0f7acf8953a1677774f5e5302dc98d3f2df712c4c6693df36c0bf27dc105822d
[INFO] running `Command { std: "docker" "start" "-a" "0f7acf8953a1677774f5e5302dc98d3f2df712c4c6693df36c0bf27dc105822d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f7acf8953a1677774f5e5302dc98d3f2df712c4c6693df36c0bf27dc105822d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f7acf8953a1677774f5e5302dc98d3f2df712c4c6693df36c0bf27dc105822d", kill_on_drop: false }`
[INFO] [stdout] 0f7acf8953a1677774f5e5302dc98d3f2df712c4c6693df36c0bf27dc105822d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c2f38c6ed49694d7b0f9cbabe5e27b44c2c7a78d6ebf794160b698f3404725ef
[INFO] running `Command { std: "docker" "start" "-a" "c2f38c6ed49694d7b0f9cbabe5e27b44c2c7a78d6ebf794160b698f3404725ef", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-sink v0.3.32
[INFO] [stderr]    Compiling x86 v0.52.0
[INFO] [stderr]     Checking futures-core v0.3.32
[INFO] [stderr]     Checking futures-task v0.3.32
[INFO] [stderr]     Checking bit_field v0.10.3
[INFO] [stderr]     Checking slab v0.4.12
[INFO] [stderr]     Checking bitflags v2.11.1
[INFO] [stderr]     Checking conquer-util v0.3.0
[INFO] [stderr]     Checking volatile v0.3.0
[INFO] [stderr]     Checking futures-io v0.3.32
[INFO] [stderr]     Checking raw-cpuid v10.7.0
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking spinning_top v0.2.5
[INFO] [stderr]     Checking crossbeam-queue v0.3.12
[INFO] [stderr]     Checking conquer-once v0.4.0
[INFO] [stderr]     Checking linked_list_allocator v0.10.6
[INFO] [stderr]     Checking futures-channel v0.3.32
[INFO] [stderr]     Checking futures-util v0.3.32
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]     Checking mango-core v0.2.1
[INFO] [stderr]     Checking uart_16550 v0.3.2
[INFO] [stderr]     Checking mango-hal v0.2.1
[INFO] [stderr]     Checking futures v0.3.32
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/mango-hal-0.2.1/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(abi_x86_interrupt)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout]   = help: the feature `asm_const` has been stable since `1.82.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mango-hal` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "c2f38c6ed49694d7b0f9cbabe5e27b44c2c7a78d6ebf794160b698f3404725ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2f38c6ed49694d7b0f9cbabe5e27b44c2c7a78d6ebf794160b698f3404725ef", kill_on_drop: false }`
[INFO] [stdout] c2f38c6ed49694d7b0f9cbabe5e27b44c2c7a78d6ebf794160b698f3404725ef