[INFO] fetching crate seam_argparse_proc_macro 0.1.1...
[INFO] testing seam_argparse_proc_macro-0.1.1 against 1.95.0 for beta-1.96-2
[INFO] extracting crate seam_argparse_proc_macro 0.1.1 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate seam_argparse_proc_macro 0.1.1
[INFO] finished tweaking crates.io crate seam_argparse_proc_macro 0.1.1
[INFO] tweaked toml for crates.io crate seam_argparse_proc_macro 0.1.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate seam_argparse_proc_macro 0.1.1 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] crate crates.io crate seam_argparse_proc_macro 0.1.1 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]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v2.0.89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 3df11b8d7b02291090ee8cb32392e0e3ba74a34a8ea89a5ed80485c4a4d46f2e
[INFO] running `Command { std: "docker" "start" "-a" "3df11b8d7b02291090ee8cb32392e0e3ba74a34a8ea89a5ed80485c4a4d46f2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3df11b8d7b02291090ee8cb32392e0e3ba74a34a8ea89a5ed80485c4a4d46f2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3df11b8d7b02291090ee8cb32392e0e3ba74a34a8ea89a5ed80485c4a4d46f2e", kill_on_drop: false }`
[INFO] [stdout] 3df11b8d7b02291090ee8cb32392e0e3ba74a34a8ea89a5ed80485c4a4d46f2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9486ffd8967eab82ca1a7e119840cf942ca7025c98875a95e41dc1970468ff0e
[INFO] running `Command { std: "docker" "start" "-a" "9486ffd8967eab82ca1a7e119840cf942ca7025c98875a95e41dc1970468ff0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-ident v1.0.14
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.89
[INFO] [stderr]    Compiling seam_argparse_proc_macro v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_span)]
[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 `seam_argparse_proc_macro` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "9486ffd8967eab82ca1a7e119840cf942ca7025c98875a95e41dc1970468ff0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9486ffd8967eab82ca1a7e119840cf942ca7025c98875a95e41dc1970468ff0e", kill_on_drop: false }`
[INFO] [stdout] 9486ffd8967eab82ca1a7e119840cf942ca7025c98875a95e41dc1970468ff0e
