[INFO] fetching crate discrete_range_map 0.5.2...
[INFO] testing discrete_range_map-0.5.2 against 1.75.0 for beta-1.76-1
[INFO] extracting crate discrete_range_map 0.5.2 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate discrete_range_map 0.5.2 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate discrete_range_map 0.5.2
[INFO] finished tweaking crates.io crate discrete_range_map 0.5.2
[INFO] tweaked toml for crates.io crate discrete_range_map 0.5.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded btree_monstrousity v0.0.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bffe760933a8f6fb8cca9116602dd4bb512cfd0349113f4a33974303b0ee6079
[INFO] running `Command { std: "docker" "start" "-a" "bffe760933a8f6fb8cca9116602dd4bb512cfd0349113f4a33974303b0ee6079", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bffe760933a8f6fb8cca9116602dd4bb512cfd0349113f4a33974303b0ee6079", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bffe760933a8f6fb8cca9116602dd4bb512cfd0349113f4a33974303b0ee6079", kill_on_drop: false }`
[INFO] [stdout] bffe760933a8f6fb8cca9116602dd4bb512cfd0349113f4a33974303b0ee6079
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3b1d4a2a7f1db4ed43a640d52550d382fe69f86ed160ead181cac2e19aee0ec
[INFO] running `Command { std: "docker" "start" "-a" "b3b1d4a2a7f1db4ed43a640d52550d382fe69f86ed160ead181cac2e19aee0ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling serde v1.0.194
[INFO] [stderr]    Compiling either v1.9.0
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling itertools v0.11.0
[INFO] [stderr]    Compiling btree_monstrousity v0.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.194
[INFO] [stderr]    Compiling discrete_range_map v0.5.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:264:1
[INFO] [stdout]     |
[INFO] [stdout] 264 | #![feature(let_chains)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:265:1
[INFO] [stdout]     |
[INFO] [stdout] 265 | #![feature(btree_cursors)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:266:1
[INFO] [stdout]     |
[INFO] [stdout] 266 | #![feature(step_trait)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:265:12
[INFO] [stdout]     |
[INFO] [stdout] 265 | #![feature(btree_cursors)]
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:266:12
[INFO] [stdout]     |
[INFO] [stdout] 266 | #![feature(step_trait)]
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `discrete_range_map` (lib) due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "b3b1d4a2a7f1db4ed43a640d52550d382fe69f86ed160ead181cac2e19aee0ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3b1d4a2a7f1db4ed43a640d52550d382fe69f86ed160ead181cac2e19aee0ec", kill_on_drop: false }`
[INFO] [stdout] b3b1d4a2a7f1db4ed43a640d52550d382fe69f86ed160ead181cac2e19aee0ec
