[INFO] fetching crate sav 0.2.0...
[INFO] checking sav-0.2.0 against 1.95.0 for pr-155915
[INFO] extracting crate sav 0.2.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate sav 0.2.0
[INFO] finished tweaking crates.io crate sav 0.2.0
[INFO] tweaked toml for crates.io crate sav 0.2.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sav 0.2.0 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 sav 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tinytemplate v1.2.1
[INFO] [stderr]   Downloaded plotters-svg v0.3.7
[INFO] [stderr]   Downloaded plotters-backend v0.3.7
[INFO] [stderr]   Downloaded oorandom v11.1.5
[INFO] [stderr]   Downloaded cast v0.3.0
[INFO] [stderr]   Downloaded textwrap v0.11.0
[INFO] [stderr]   Downloaded serde_cbor v0.11.2
[INFO] [stderr]   Downloaded criterion-plot v0.4.5
[INFO] [stderr]   Downloaded half v1.8.3
[INFO] [stderr]   Downloaded criterion v0.3.6
[INFO] [stderr]   Downloaded plotters v0.3.7
[INFO] [stderr]   Downloaded serde_json v1.0.142
[INFO] [stderr]   Downloaded clap v2.34.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f5eac6ac951ad522e999606cbcb66f2486ccebbb491b8e7230052418b2c24fc9
[INFO] running `Command { std: "docker" "start" "-a" "f5eac6ac951ad522e999606cbcb66f2486ccebbb491b8e7230052418b2c24fc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5eac6ac951ad522e999606cbcb66f2486ccebbb491b8e7230052418b2c24fc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5eac6ac951ad522e999606cbcb66f2486ccebbb491b8e7230052418b2c24fc9", kill_on_drop: false }`
[INFO] [stdout] f5eac6ac951ad522e999606cbcb66f2486ccebbb491b8e7230052418b2c24fc9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 0eb84e3205f3ddfc7be62ebda2cb8c067b645f20696f5d1279f34dd93cd90aa6
[INFO] running `Command { std: "docker" "start" "-a" "0eb84e3205f3ddfc7be62ebda2cb8c067b645f20696f5d1279f34dd93cd90aa6", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling serde_json v1.0.142
[INFO] [stderr]     Checking either v1.15.0
[INFO] [stderr]     Checking sav v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(macro_metavar_expr)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking plotters-backend v0.3.7
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sav` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "0eb84e3205f3ddfc7be62ebda2cb8c067b645f20696f5d1279f34dd93cd90aa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0eb84e3205f3ddfc7be62ebda2cb8c067b645f20696f5d1279f34dd93cd90aa6", kill_on_drop: false }`
[INFO] [stdout] 0eb84e3205f3ddfc7be62ebda2cb8c067b645f20696f5d1279f34dd93cd90aa6
