[INFO] crate lexer 0.1.15 is already in cache
[INFO] extracting crate lexer 0.1.15 into work/ex/beta-1.37-6/sources/1.36.0/reg/lexer/0.1.15
[INFO] extracting crate lexer 0.1.15 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/lexer/0.1.15
[INFO] validating manifest of lexer-0.1.15 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lexer-0.1.15 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lexer-0.1.15
[INFO] finished frobbing lexer-0.1.15
[INFO] frobbed toml for lexer-0.1.15 written to work/ex/beta-1.37-6/sources/1.36.0/reg/lexer/0.1.15/Cargo.toml
[INFO] started frobbing lexer-0.1.15
[INFO] finished frobbing lexer-0.1.15
[INFO] frobbed toml for lexer-0.1.15 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/lexer/0.1.15/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing lexer-0.1.15 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/lexer/0.1.15:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 159524bd6b41f4507f7a144d548fb63ae2acc6b9c5ba2e8659e9c08ca563dfa8
[INFO] running `"docker" "start" "-a" "159524bd6b41f4507f7a144d548fb63ae2acc6b9c5ba2e8659e9c08ca563dfa8"`
[INFO] [stderr]    Compiling peek-nth v0.1.0
[INFO] [stderr]    Compiling lexer v0.1.15 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `alloc::arc`
[INFO] [stderr]  --> src/readers.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | use alloc::arc::Arc;
[INFO] [stderr]   |            ^^^ could not find `arc` in `alloc`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `alloc::arc`
[INFO] [stderr]  --> src/readers_builder.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | use alloc::arc::Arc;
[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(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(get_type_id)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Any`
[INFO] [stderr]  --> src/readers.rs:4:17
[INFO] [stderr]   |
[INFO] [stderr] 4 | use core::any::{Any, TypeId};
[INFO] [stderr]   |                 ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `T` is never used
[INFO] [stderr]  --> src/readers.rs:9:20
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub struct Readers<T, E>(Vec<Arc<Reader<T, E>>>);
[INFO] [stderr]   |                    ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `T` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `E` is never used
[INFO] [stderr]  --> src/readers.rs:9:23
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub struct Readers<T, E>(Vec<Arc<Reader<T, E>>>);
[INFO] [stderr]   |                       ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `E` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `T` is never used
[INFO] [stderr]    --> src/readers.rs:110:28
[INFO] [stderr]     |
[INFO] [stderr] 110 | pub struct ReadersIter<'a, T, E>
[INFO] [stderr]     |                            ^ unused parameter
[INFO] [stderr]     |
[INFO] [stderr]     = help: consider removing `T` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `E` is never used
[INFO] [stderr]    --> src/readers.rs:110:31
[INFO] [stderr]     |
[INFO] [stderr] 110 | pub struct ReadersIter<'a, T, E>
[INFO] [stderr]     |                               ^ unused parameter
[INFO] [stderr]     |
[INFO] [stderr]     = help: consider removing `E` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `T` is never used
[INFO] [stderr]  --> src/readers_builder.rs:6:27
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct ReadersBuilder<T, E>(pub(crate) Vec<Arc<Reader<T, E>>>);
[INFO] [stderr]   |                           ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `T` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `E` is never used
[INFO] [stderr]  --> src/readers_builder.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct ReadersBuilder<T, E>(pub(crate) Vec<Arc<Reader<T, E>>>);
[INFO] [stderr]   |                              ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `E` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `T` is never used
[INFO] [stderr]  --> src/readers_lexer.rs:5:29
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct ReadersLexer<'a, T, E, I>
[INFO] [stderr]   |                             ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `T` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error[E0392]: parameter `E` is never used
[INFO] [stderr]  --> src/readers_lexer.rs:5:32
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct ReadersLexer<'a, T, E, I>
[INFO] [stderr]   |                                ^ unused parameter
[INFO] [stderr]   |
[INFO] [stderr]   = help: consider removing `E` or using a marker such as `core::marker::PhantomData`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 12 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0392, E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0392`.
[INFO] [stderr] error: Could not compile `lexer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "159524bd6b41f4507f7a144d548fb63ae2acc6b9c5ba2e8659e9c08ca563dfa8"`
[INFO] running `"docker" "rm" "-f" "159524bd6b41f4507f7a144d548fb63ae2acc6b9c5ba2e8659e9c08ca563dfa8"`
[INFO] [stdout] 159524bd6b41f4507f7a144d548fb63ae2acc6b9c5ba2e8659e9c08ca563dfa8