[INFO] crate shared_slice 0.0.4 is already in cache [INFO] extracting crate shared_slice 0.0.4 into work/ex/beta-1.38-1/sources/1.37.0/reg/shared_slice/0.0.4 [INFO] extracting crate shared_slice 0.0.4 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/shared_slice/0.0.4 [INFO] validating manifest of shared_slice-0.0.4 on toolchain 1.37.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of shared_slice-0.0.4 on toolchain beta-2019-08-13 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing shared_slice-0.0.4 [INFO] finished frobbing shared_slice-0.0.4 [INFO] frobbed toml for shared_slice-0.0.4 written to work/ex/beta-1.38-1/sources/1.37.0/reg/shared_slice/0.0.4/Cargo.toml [INFO] started frobbing shared_slice-0.0.4 [INFO] finished frobbing shared_slice-0.0.4 [INFO] frobbed toml for shared_slice-0.0.4 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/shared_slice/0.0.4/Cargo.toml [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing shared_slice-0.0.4 against 1.37.0 for beta-1.38-1 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/shared_slice/0.0.4:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"` [INFO] [stdout] d4d234e2b6ec78f642df2b6522adcd0885fafc1cf51afef920f9487247cd06e3 [INFO] running `"docker" "start" "-a" "d4d234e2b6ec78f642df2b6522adcd0885fafc1cf51afef920f9487247cd06e3"` [INFO] [stderr] Compiling shared_slice v0.0.4 (/opt/crater/workdir) [INFO] [stderr] error[E0259]: the name `core` is defined multiple times [INFO] [stderr] --> src/lib.rs:79:1 [INFO] [stderr] | [INFO] [stderr] 79 | extern crate core; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ `core` reimported here [INFO] [stderr] | [INFO] [stderr] = note: `core` must be defined only once in the type namespace of this module [INFO] [stderr] help: you can use `as` to change the binding name of the import [INFO] [stderr] | [INFO] [stderr] 79 | extern crate core as other_core; [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] error[E0432]: unresolved import `alloc::arc` [INFO] [stderr] --> src/arc.rs:8:12 [INFO] [stderr] | [INFO] [stderr] 8 | use alloc::arc::{Arc, Weak}; [INFO] [stderr] | ^^^ could not find `arc` in `alloc` [INFO] [stderr] [INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel [INFO] [stderr] --> src/lib.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | #![feature(no_std)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel [INFO] [stderr] --> src/lib.rs:76:1 [INFO] [stderr] | [INFO] [stderr] 76 | #![feature(core, alloc)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `core::prelude::*` [INFO] [stderr] --> src/rc.rs:3:5 [INFO] [stderr] | [INFO] [stderr] 3 | use core::prelude::*; [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `core::prelude::*` [INFO] [stderr] --> src/arc.rs:3:5 [INFO] [stderr] | [INFO] [stderr] 3 | use core::prelude::*; [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0599]: no method named `downgrade` found for type `alloc::rc::Rc>` in the current scope [INFO] [stderr] --> src/rc.rs:73:33 [INFO] [stderr] | [INFO] [stderr] 73 | counts: self.counts.downgrade() [INFO] [stderr] | ------------^^^^^^^^^ [INFO] [stderr] | | | [INFO] [stderr] | | this is an associated function, not a method [INFO] [stderr] | help: use associated function syntax instead: `alloc::rc::Rc>::downgrade` [INFO] [stderr] | [INFO] [stderr] = note: found the following associated functions; to be used as methods, functions must have a `self` parameter [INFO] [stderr] = note: the candidate is defined in an impl for the type `alloc::rc::Rc<_>` [INFO] [stderr] [INFO] [stderr] error: aborting due to 5 previous errors [INFO] [stderr] [INFO] [stderr] Some errors have detailed explanations: E0259, E0432, E0554, E0599. [INFO] [stderr] For more information about an error, try `rustc --explain E0259`. [INFO] [stderr] error: Could not compile `shared_slice`. [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `"docker" "inspect" "d4d234e2b6ec78f642df2b6522adcd0885fafc1cf51afef920f9487247cd06e3"` [INFO] running `"docker" "rm" "-f" "d4d234e2b6ec78f642df2b6522adcd0885fafc1cf51afef920f9487247cd06e3"` [INFO] [stdout] d4d234e2b6ec78f642df2b6522adcd0885fafc1cf51afef920f9487247cd06e3