[INFO] fetching crate delay_line 0.1.2...
[INFO] testing delay_line-0.1.2 against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate delay_line 0.1.2 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate delay_line 0.1.2
[INFO] finished tweaking crates.io crate delay_line 0.1.2
[INFO] tweaked toml for crates.io crate delay_line 0.1.2 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate delay_line 0.1.2 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate delay_line 0.1.2 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" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb
[INFO] running `Command { std: "docker" "start" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling delay_line v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(allocator_api)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `inherent_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(inherent_associated_types)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:437:9
[INFO] [stdout]     |
[INFO] [stdout] 431 |     pub fn push_in_within_capacity(&mut self, value: T) -> Result<(), T>
[INFO] [stdout]     |                                                            ------------- expected `Result<(), T>` because of return type
[INFO] [stdout] ...
[INFO] [stdout] 437 |         self.make_contiguous().push_within_capacity(value)
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<(), T>`, found `Result<&mut T, T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected enum `Result<(), _>`
[INFO] [stdout]                found enum `Result<&mut T, _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]     --> src/lib.rs:975:79
[INFO] [stdout]      |
[INFO] [stdout]  975 |                 self.len() == other.len() && eq_slice(self.as_slices(), other.as_slice())
[INFO] [stdout]      |                                                                               ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1022 | impl_cmp_2_1!({} Slice<T2>);
[INFO] [stdout]      | --------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = help: call with fully qualified syntax `as_slice(...)` to keep using the current method
[INFO] [stdout]      = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]      = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]      = note: `#[warn(unstable_name_collisions)]` (part of `#[warn(future_incompatible)]`) on by default
[INFO] [stdout]      = note: this warning originates in the macro `impl_cmp_2_1` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]     --> src/lib.rs:998:61
[INFO] [stdout]      |
[INFO] [stdout]  998 |                 self.len() == other.len() && req_slice(self.as_slice(), other.as_slices())
[INFO] [stdout]      |                                                             ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1022 | impl_cmp_2_1!({} Slice<T2>);
[INFO] [stdout]      | --------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = help: call with fully qualified syntax `as_slice(...)` to keep using the current method
[INFO] [stdout]      = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]      = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]      = note: this warning originates in the macro `impl_cmp_2_1` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `delay_line` (lib) due to 2 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb", kill_on_drop: false }`
[INFO] [stdout] 7902e467e6c976372632ce5b0e7ba9c28d1a626362f4b438397fe6f5f10954fb
