[INFO] crate collect 0.0.26 is already in cache
[INFO] extracting crate collect 0.0.26 into work/ex/beta-1.38-1/sources/1.37.0/reg/collect/0.0.26
[INFO] extracting crate collect 0.0.26 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/collect/0.0.26
[INFO] validating manifest of collect-0.0.26 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 collect-0.0.26 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 collect-0.0.26
[INFO] finished frobbing collect-0.0.26
[INFO] frobbed toml for collect-0.0.26 written to work/ex/beta-1.38-1/sources/1.37.0/reg/collect/0.0.26/Cargo.toml
[INFO] started frobbing collect-0.0.26
[INFO] finished frobbing collect-0.0.26
[INFO] frobbed toml for collect-0.0.26 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/collect/0.0.26/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 collect-0.0.26 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/collect/0.0.26:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 8193a3cc289a08a85d9fdf0a86c3afefbd52790e0192031fda5cd14c0c98e255
[INFO] running `"docker" "start" "-a" "8193a3cc289a08a85d9fdf0a86c3afefbd52790e0192031fda5cd14c0c98e255"`
[INFO] [stderr] warning: dependency (compare) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr] warning: dependency (ordered_iter) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr] warning: dependency (traverse) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling compare v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling bit-set v0.5.1
[INFO] [stderr]    Compiling ordered_iter v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling traverse v0.0.12
[INFO] [stderr]    Compiling collect v0.0.26 (/opt/crater/workdir)
[INFO] [stderr] warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
[INFO] [stderr]   --> src/lib.rs:24:10
[INFO] [stderr]    |
[INFO] [stderr] 24 | #![allow(raw_pointer_derive)]
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::num::Int`
[INFO] [stderr]  --> src/blist.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::num::Int;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `core::num::Int`
[INFO] [stderr]   --> src/enum_set.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use core::num::Int;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::rc::try_unwrap`
[INFO] [stderr]  --> src/immut_slist.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::rc::{try_unwrap, Rc};
[INFO] [stderr]   |               ^^^^^^^^^^ no `try_unwrap` in `rc`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::collections::hash_state`
[INFO] [stderr]   --> src/linked_hash_map.rs:34:23
[INFO] [stderr]    |
[INFO] [stderr] 34 | use std::collections::hash_state::HashState;
[INFO] [stderr]    |                       ^^^^^^^^^^ could not find `hash_state` in `collections`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::marker::NoCopy`
[INFO] [stderr]  --> src/proto/dlist.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::marker::{NoCopy, PhantomData};
[INFO] [stderr]   |                   ^^^^^^
[INFO] [stderr]   |                   |
[INFO] [stderr]   |                   no `NoCopy` in `marker`
[INFO] [stderr]   |                   help: a similar name exists in the module: `Copy`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `self::alloc::arc`
[INFO] [stderr]  --> src/proto/par_vec.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use self::alloc::arc;
[INFO] [stderr]   |     ^^^^^^^^^^^^^---
[INFO] [stderr]   |     |            |
[INFO] [stderr]   |     |            help: a similar name exists in the module: `rc`
[INFO] [stderr]   |     no `arc` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::iter::range_inclusive`
[INFO] [stderr]  --> src/proto/par_vec.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::iter::range_inclusive;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ no `range_inclusive` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/tree/map.rs:146:15
[INFO] [stderr]     |
[INFO] [stderr] 146 |         iter::order::partial_cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/tree/map.rs:154:15
[INFO] [stderr]     |
[INFO] [stderr] 154 |         iter::order::cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/tree/set.rs:102:15
[INFO] [stderr]     |
[INFO] [stderr] 102 |         iter::order::cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/blist.rs:454:19
[INFO] [stderr]     |
[INFO] [stderr] 454 |             iter::order::eq(self.iter(), other.iter())
[INFO] [stderr]     |                   ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/blist.rs:459:19
[INFO] [stderr]     |
[INFO] [stderr] 459 |             iter::order::ne(self.iter(), other.iter())
[INFO] [stderr]     |                   ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/blist.rs:467:15
[INFO] [stderr]     |
[INFO] [stderr] 467 |         iter::order::partial_cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/blist.rs:474:15
[INFO] [stderr]     |
[INFO] [stderr] 474 |         iter::order::cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute macro `unsafe_destructor` in this scope
[INFO] [stderr]    --> src/immut_slist.rs:104:3
[INFO] [stderr]     |
[INFO] [stderr] 104 | #[unsafe_destructor]
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/immut_slist.rs:158:24
[INFO] [stderr]     |
[INFO] [stderr] 158 |             std::iter::order::eq(self.iter(), other.iter())
[INFO] [stderr]     |                        ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/immut_slist.rs:163:24
[INFO] [stderr]     |
[INFO] [stderr] 163 |             std::iter::order::ne(self.iter(), other.iter())
[INFO] [stderr]     |                        ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/immut_slist.rs:169:20
[INFO] [stderr]     |
[INFO] [stderr] 169 |         std::iter::order::partial_cmp(self.iter(), other.iter())
[INFO] [stderr]     |                    ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute macro `unsafe_destructor` in this scope
[INFO] [stderr]    --> src/linked_hash_map.rs:528:3
[INFO] [stderr]     |
[INFO] [stderr] 528 | #[unsafe_destructor]
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute macro `unsafe_destructor` in this scope
[INFO] [stderr]    --> src/proto/dlist.rs:667:3
[INFO] [stderr]     |
[INFO] [stderr] 667 | #[unsafe_destructor]
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/proto/dlist.rs:692:19
[INFO] [stderr]     |
[INFO] [stderr] 692 |             iter::order::eq(self.iter(), other.iter())
[INFO] [stderr]     |                   ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/proto/dlist.rs:697:19
[INFO] [stderr]     |
[INFO] [stderr] 697 |             iter::order::ne(self.iter(), other.iter())
[INFO] [stderr]     |                   ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/proto/dlist.rs:705:15
[INFO] [stderr]     |
[INFO] [stderr] 705 |         iter::order::partial_cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `order` in `iter`
[INFO] [stderr]    --> src/proto/dlist.rs:712:15
[INFO] [stderr]     |
[INFO] [stderr] 712 |         iter::order::cmp(self.iter(), other.iter())
[INFO] [stderr]     |               ^^^^^ could not find `order` in `iter`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]   --> src/immut_slist.rs:65:22
[INFO] [stderr]    |
[INFO] [stderr] 65 |             for _ in range(0, n) {
[INFO] [stderr]    |                      ^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]    |
[INFO] [stderr] 1  | use traverse::utils::range;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]    --> src/interval_heap.rs:334:22
[INFO] [stderr]     |
[INFO] [stderr] 334 |         for hsize in range(2, vec.len()).rev() {
[INFO] [stderr]     |                      ^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 3   | use traverse::utils::range;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `into_raw` in module `boxed`
[INFO] [stderr]   --> src/linked_hash_map.rs:99:34
[INFO] [stderr]    |
[INFO] [stderr] 99 |             head: unsafe{ boxed::into_raw(box mem::uninitialized::<LinkedHashMapEntry<K, V>>()) },
[INFO] [stderr]    |                                  ^^^^^^^^ not found in `boxed`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `copy_mut_lifetime` in module `mem`
[INFO] [stderr]    --> src/proto/dlist.rs:382:35
[INFO] [stderr]     |
[INFO] [stderr] 382 |                         Some(mem::copy_mut_lifetime(self, &mut next.elem))
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^ not found in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `copy_mut_lifetime` in module `mem`
[INFO] [stderr]    --> src/proto/dlist.rs:403:31
[INFO] [stderr]     |
[INFO] [stderr] 403 |                     Some(mem::copy_mut_lifetime(self, &mut prev.elem))
[INFO] [stderr]     |                               ^^^^^^^^^^^^^^^^^ not found in `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]    --> src/proto/dlist.rs:538:18
[INFO] [stderr]     |
[INFO] [stderr] 538 |         for _ in range(0, by) { self.next(); }
[INFO] [stderr]     |                  ^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 1   | use traverse::utils::range;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]    --> src/proto/dlist.rs:543:18
[INFO] [stderr]     |
[INFO] [stderr] 543 |         for _ in range(0, by) { self.prev(); }
[INFO] [stderr]     |                  ^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 1   | use traverse::utils::range;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `range` in this scope
[INFO] [stderr]    --> src/proto/linear_map.rs:208:18
[INFO] [stderr]     |
[INFO] [stderr] 208 |         for i in range(0, self.storage.len()) {
[INFO] [stderr]     |                  ^^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]     |
[INFO] [stderr] 5   | use traverse::utils::range;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: module `range` is private
[INFO] [stderr]   --> src/lru_cache.rs:42:17
[INFO] [stderr]    |
[INFO] [stderr] 42 | use std::iter::{range, IntoIterator, Extend};
[INFO] [stderr]    |                 ^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(box_patterns, box_syntax)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | #![feature(std_misc)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | #![feature(unboxed_closures)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | #![feature(unsafe_destructor)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![feature(core, hash, alloc)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:200:5
[INFO] [stderr]     |
[INFO] [stderr] 200 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:229:5
[INFO] [stderr]     |
[INFO] [stderr] 229 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:254:5
[INFO] [stderr]     |
[INFO] [stderr] 254 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:278:5
[INFO] [stderr]     |
[INFO] [stderr] 278 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:330:5
[INFO] [stderr]     |
[INFO] [stderr] 330 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:381:5
[INFO] [stderr]     |
[INFO] [stderr] 381 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:406:5
[INFO] [stderr]     |
[INFO] [stderr] 406 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:421:5
[INFO] [stderr]     |
[INFO] [stderr] 421 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:437:5
[INFO] [stderr]     |
[INFO] [stderr] 437 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:459:5
[INFO] [stderr]     |
[INFO] [stderr] 459 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:488:5
[INFO] [stderr]     |
[INFO] [stderr] 488 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:514:5
[INFO] [stderr]     |
[INFO] [stderr] 514 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:543:5
[INFO] [stderr]     |
[INFO] [stderr] 543 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/map.rs:566:5
[INFO] [stderr]     |
[INFO] [stderr] 566 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:134:5
[INFO] [stderr]     |
[INFO] [stderr] 134 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 161 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:198:5
[INFO] [stderr]     |
[INFO] [stderr] 198 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:266:5
[INFO] [stderr]     |
[INFO] [stderr] 266 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:298:5
[INFO] [stderr]     |
[INFO] [stderr] 298 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:327:5
[INFO] [stderr]     |
[INFO] [stderr] 327 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:356:5
[INFO] [stderr]     |
[INFO] [stderr] 356 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:380:5
[INFO] [stderr]     |
[INFO] [stderr] 380 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:395:5
[INFO] [stderr]     |
[INFO] [stderr] 395 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:411:5
[INFO] [stderr]     |
[INFO] [stderr] 411 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:430:5
[INFO] [stderr]     |
[INFO] [stderr] 430 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:454:5
[INFO] [stderr]     |
[INFO] [stderr] 454 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:475:5
[INFO] [stderr]     |
[INFO] [stderr] 475 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:520:5
[INFO] [stderr]     |
[INFO] [stderr] 520 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:540:5
[INFO] [stderr]     |
[INFO] [stderr] 540 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:562:5
[INFO] [stderr]     |
[INFO] [stderr] 562 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:698:1
[INFO] [stderr]     |
[INFO] [stderr] 698 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:726:1
[INFO] [stderr]     |
[INFO] [stderr] 726 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:754:1
[INFO] [stderr]     |
[INFO] [stderr] 754 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/tree/set.rs:782:1
[INFO] [stderr]     |
[INFO] [stderr] 782 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]   --> src/enum_set.rs:95:5
[INFO] [stderr]    |
[INFO] [stderr] 95 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 105 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:133:5
[INFO] [stderr]     |
[INFO] [stderr] 133 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/enum_set.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]   --> src/lru_cache.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]   --> src/lru_cache.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:181:5
[INFO] [stderr]     |
[INFO] [stderr] 181 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 195 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:199:5
[INFO] [stderr]     |
[INFO] [stderr] 199 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]    --> src/lru_cache.rs:203:5
[INFO] [stderr]     |
[INFO] [stderr] 203 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/interval_heap.rs:292:14
[INFO] [stderr]     |
[INFO] [stderr] 292 |             1...2 => Some(self.data.swap_remove(0)),
[INFO] [stderr]     |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/interval_heap.rs:307:14
[INFO] [stderr]     |
[INFO] [stderr] 307 |             0...2 => self.data.pop(),
[INFO] [stderr]     |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Debug`
[INFO] [stderr]  --> src/proto/dlist.rs:2:22
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::fmt::{self, Debug};
[INFO] [stderr]   |                      ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:200:5
[INFO] [stderr]     |
[INFO] [stderr] 200 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:229:5
[INFO] [stderr]     |
[INFO] [stderr] 229 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:254:5
[INFO] [stderr]     |
[INFO] [stderr] 254 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:278:5
[INFO] [stderr]     |
[INFO] [stderr] 278 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:330:5
[INFO] [stderr]     |
[INFO] [stderr] 330 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:381:5
[INFO] [stderr]     |
[INFO] [stderr] 381 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:406:5
[INFO] [stderr]     |
[INFO] [stderr] 406 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:421:5
[INFO] [stderr]     |
[INFO] [stderr] 421 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:437:5
[INFO] [stderr]     |
[INFO] [stderr] 437 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:459:5
[INFO] [stderr]     |
[INFO] [stderr] 459 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:488:5
[INFO] [stderr]     |
[INFO] [stderr] 488 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:514:5
[INFO] [stderr]     |
[INFO] [stderr] 514 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:543:5
[INFO] [stderr]     |
[INFO] [stderr] 543 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/map.rs:566:5
[INFO] [stderr]     |
[INFO] [stderr] 566 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:134:5
[INFO] [stderr]     |
[INFO] [stderr] 134 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 161 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:198:5
[INFO] [stderr]     |
[INFO] [stderr] 198 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:266:5
[INFO] [stderr]     |
[INFO] [stderr] 266 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:298:5
[INFO] [stderr]     |
[INFO] [stderr] 298 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:327:5
[INFO] [stderr]     |
[INFO] [stderr] 327 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:356:5
[INFO] [stderr]     |
[INFO] [stderr] 356 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:380:5
[INFO] [stderr]     |
[INFO] [stderr] 380 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:395:5
[INFO] [stderr]     |
[INFO] [stderr] 395 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:411:5
[INFO] [stderr]     |
[INFO] [stderr] 411 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:430:5
[INFO] [stderr]     |
[INFO] [stderr] 430 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:454:5
[INFO] [stderr]     |
[INFO] [stderr] 454 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:475:5
[INFO] [stderr]     |
[INFO] [stderr] 475 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:520:5
[INFO] [stderr]     |
[INFO] [stderr] 520 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:540:5
[INFO] [stderr]     |
[INFO] [stderr] 540 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:562:5
[INFO] [stderr]     |
[INFO] [stderr] 562 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:698:1
[INFO] [stderr]     |
[INFO] [stderr] 698 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:726:1
[INFO] [stderr]     |
[INFO] [stderr] 726 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:754:1
[INFO] [stderr]     |
[INFO] [stderr] 754 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/tree/set.rs:782:1
[INFO] [stderr]     |
[INFO] [stderr] 782 | #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/enum_set.rs:95:5
[INFO] [stderr]    |
[INFO] [stderr] 95 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 105 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:121:5
[INFO] [stderr]     |
[INFO] [stderr] 121 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:133:5
[INFO] [stderr]     |
[INFO] [stderr] 133 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:165:5
[INFO] [stderr]     |
[INFO] [stderr] 165 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/enum_set.rs:171:5
[INFO] [stderr]     |
[INFO] [stderr] 171 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/lru_cache.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/lru_cache.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:111:5
[INFO] [stderr]     |
[INFO] [stderr] 111 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:181:5
[INFO] [stderr]     |
[INFO] [stderr] 181 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 195 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:199:5
[INFO] [stderr]     |
[INFO] [stderr] 199 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> src/lru_cache.rs:203:5
[INFO] [stderr]     |
[INFO] [stderr] 203 |     #[unstable = "matches collection reform specification, waiting for dust to settle"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 144 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0432, E0433, E0554, E0603.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `collect`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8193a3cc289a08a85d9fdf0a86c3afefbd52790e0192031fda5cd14c0c98e255"`
[INFO] running `"docker" "rm" "-f" "8193a3cc289a08a85d9fdf0a86c3afefbd52790e0192031fda5cd14c0c98e255"`
[INFO] [stdout] 8193a3cc289a08a85d9fdf0a86c3afefbd52790e0192031fda5cd14c0c98e255