[INFO] fetching crate mrc 0.2.3...
[INFO] checking mrc-0.2.3 against 1.95.0 for pr-155915
[INFO] extracting crate mrc 0.2.3 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate mrc 0.2.3
[INFO] finished tweaking crates.io crate mrc 0.2.3
[INFO] tweaked toml for crates.io crate mrc 0.2.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mrc 0.2.3 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] crate crates.io crate mrc 0.2.3 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f601631dd35806c42ceda47cdd1f8261076f230719d8163eb106720b4a13e55
[INFO] running `Command { std: "docker" "start" "-a" "8f601631dd35806c42ceda47cdd1f8261076f230719d8163eb106720b4a13e55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f601631dd35806c42ceda47cdd1f8261076f230719d8163eb106720b4a13e55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f601631dd35806c42ceda47cdd1f8261076f230719d8163eb106720b4a13e55", kill_on_drop: false }`
[INFO] [stdout] 8f601631dd35806c42ceda47cdd1f8261076f230719d8163eb106720b4a13e55
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ca0bd6aba219547f68d887a4d8b475451d70fc238146229dd6bbf745444b441
[INFO] running `Command { std: "docker" "start" "-a" "9ca0bd6aba219547f68d887a4d8b475451d70fc238146229dd6bbf745444b441", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.97
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]    Compiling serde_json v1.0.142
[INFO] [stderr]    Compiling thiserror v2.0.16
[INFO] [stderr]     Checking half v2.6.0
[INFO] [stderr]     Checking clap_builder v4.5.44
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking rayon-core v1.13.0
[INFO] [stderr]     Checking ciborium-ll v0.2.2
[INFO] [stderr]     Checking rayon v1.11.0
[INFO] [stderr]     Checking memmap2 v0.9.7
[INFO] [stderr]     Checking is-terminal v0.4.16
[INFO] [stderr]     Checking getrandom v0.3.3
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]     Checking tempfile v3.20.0
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking criterion-plot v0.5.0
[INFO] [stderr]     Checking clap v4.5.45
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling thiserror-impl v2.0.16
[INFO] [stderr]     Checking mrc v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:30
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![cfg_attr(feature = "f16", feature(f16))]
[INFO] [stdout]    |                              ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mrc` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "9ca0bd6aba219547f68d887a4d8b475451d70fc238146229dd6bbf745444b441", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ca0bd6aba219547f68d887a4d8b475451d70fc238146229dd6bbf745444b441", kill_on_drop: false }`
[INFO] [stdout] 9ca0bd6aba219547f68d887a4d8b475451d70fc238146229dd6bbf745444b441
