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Added State Of Rust document
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‎index.md

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@@ -37,6 +37,7 @@ PRs against [rust-lang-nursery/rust-forge].
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* [Beta backporting](beta-backporting.html). The mystery of the oft-misinterpreted `beta-nominated` / `beta-accepted` tags finally revealed.
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* [Bots, websites and infrastructure](infrastructure.html). A catalog of the IRC bots, websites and other infrastructure used by the project, what they do, and who maintains them (i.e. who to contact when they malfunction and go on a bot rampage).
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* [Homu/Bors Syntax](https://buildbot2.rust-lang.org/homu/)
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* [State Of Rust](state-of-rust.html). Links and information about the current status of unstable features.
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### Meta-processes: managing the RFC repo, teams, etc
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‎state-of-rust.md

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---
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layout: default
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title: State Of Rust
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---
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This document is intended to document the current state of Rust's various
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unstable features, their current status and what's required next to
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be completed.
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| Team | Feature | Status | What's next |
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| ---- | ------- | ------ | ----------- |
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| T-compiler | [RFC amendment #1384][30450] | Implemented | Blocked on promotion to error |
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| T-compiler | [Specialization and lifetime dispatch][40582] | Unimplemented | Blocked on specialisation |
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| T-compiler | [The "ptx-kernel" ABI][38788] | Implemented | Blocked on decision to stabilise |
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| T-compiler | [The `#[wasm_custom_section]` attribute][51088] | Implemented | Blocked decision to change to a more general solution |
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| T-compiler | [The `#[wasm_import_module]` attribute][52090] | Implemented | Blocked on documentation and small design consideration |
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| T-compiler | [The `msp430-interrupt` calling convention/ABI][38487] | Implemented | Blocked on decision to stabilise |
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| T-compiler | [The `thiscall` calling convention][42202] | Implemented | Blocked on decision to stabilise |
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| T-compiler | [The `x86-interrupt` calling convention][40180] | Implemented | Blocked on LLVM bugs |
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| T-compiler | [Trait bounds not checked on specializable associated types][33017] | Unimplemented | Blocked on implementation |
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| T-compiler | [`#[may_dangle]`, a refined dropck escape hatch (RFC 1327)][34761] | Implemented | Blocked on decision to stabilise |
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| T-compiler | [`arbitrary_self_types`][44874] | Implemented | Blocked on RFC |
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| T-compiler | [`incoherent_fundamental_impls` compatibility lint][46205] | Implemented | Hard error PR blocked on second crater run |
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| T-compiler | [`legacy_directory_ownership` future-compatibility warnings][37872] | Implemented | Blocked on making the lint deny by default |
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| T-compiler | [`parenthesized_params_in_types_and_modules` future-compatibility warnings][42238] | Implemented | Blocked on making the lint a hard error |
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| T-compiler | [`safe_packed_borrows` compatibility lint][46043] | Implemented | Blocked on making the lint hard error |
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| T-compiler | [`underscore_literal_suffix` future-compatibility warnings][42326] | Implemented | Blocked on making the lint a hard error |
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| T-compiler | [`where_clauses_object_safety` future compatibility lint][51443] | Implemented | Blocked on making the lint deny by default |
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| T-compiler | [🔬 generic associated types (GAT)][44265] | Unimplemented | Blocked on implementation |
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| T-dev-tools + T-rustdoc | [`rustdoc --display-warnings`][41574] | Implemented | Blocked on decision to stabilise |
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| T-dev-tools | [Sanitizer support][39699] | Implemented | Blocked on decision to stabilise |
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| T-dev-tools | [Stabilise `-Zsave-analysis`][43606] | Unimplemented | Blocked on whether a new approach supersedes this |
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| T-dev-tools | [`#[link(kind)]` connecting libraries on Windows][37403] | Implemented | Blocked on name decision and stabilisation |
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| T-dev-tools | [`--print target-spec-json`][38338] | Implemented | Blocked on decision to stabilise |
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| T-dev-tools | [`-Z profile` ][42524] | Implemented | Blocked on decision to stabilise |
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| T-dev-tools | [libtest JSON output][49359] | Implemented | Blocked on decision to stabilise |
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| T-lang + T-libs | ["macro naming and modularisation" (RFC #1561)][35896] | Implementation in progress | Blocked on unresolved design decisions |
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| T-lang + T-libs | [RFC 1566: Procedural macros][38356] | Implementation in progress | Blocked on macros 1.2 stabilisation |
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| T-lang | ['Allow `Self` to appear in the where clause of trait impls'][38864] | Implemented | Blocked on [#35237] |
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| T-lang | [128-bit integer support (RFC 1504)][35118] | Implementation in progress | Blocked on enums with 128 discriminant |
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| T-lang | [Allocator traits and std::heap][32838] | Implementation in progress | Blocked on audit and design decisions |
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| T-lang | [Allow all literals in attributes (Tracking Issue for RFC #1559)][34981] | Implemented | Blocked on decision to stabilise |
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| T-lang | [Allowing overlapping implementations for marker trait.][29864] | Implemented | Blocked on documentation |
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| T-lang | [Exclusive range patterns][37854] | Implemented | Blocked on decision to stabilise |
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| T-lang | [Exhaustive integer patterns tracking issue][50907] | Implementation in progress | Blocked implementation being merged |
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| T-lang | [Naked fns (RFC #1201)][32408] | Implemented | Blocked on design feedback and the inline assembly feature. |
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| T-lang | [Option::xor][50512] | Implemented | Blocked on decision to stable |
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| T-lang | [Patterns in functions without body][35203] | Implemented | Blocked on making lint deny by default |
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| T-lang | [Promoting `!` to a type (RFC 1216)][35121] | Implementation in progress | Blocked on decision around coercion |
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| T-lang | [RFC 1872: `exhaustive_patterns`][51085] | Implemented | Blocked on the never type |
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| T-lang | [RFC 554: `pattern_parentheses` ][51087] | Implemented | Blocked on stabilisation PR |
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| T-lang | [The `#[used]` attribute][40289] | Implemented | Blocked on decision to stabilise |
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| T-lang | [The `lifetime` specifier for `macro_rules!`][34303] | Implemented | Waiting on 1.28.0 stable release |
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| T-lang | [Tracking issue for `fundamental` feature][29635] | Unimplemented | Blocked on further dicussion |
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| T-lang | [Tracking issue for `no_core` stabilization][29639] | Implemented | Blocked on lang items |
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| T-lang | [Tracking issue: declarative macros 2.0][39412] | Implementation in progress | Blocked on macro 2.0 hygiene RFC |
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| T-lang | [Trait aliases][41517] | Unimplemented | Blocked on implementation |
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| T-lang | [Tweaks to object safety (RFC 2027)][43561] | Unimplemented | Blocked on implementation |
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| T-lang | [Unsized tuple coercion][42877] | Implemented | Blocked on decision to stabilise |
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| T-lang | [Untagged unions (RFC 1444)][32836] | Unimplemented | Blocked on unresolved questions. |
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| T-lang | [`#[repr(packed = "N")]` (RFC 1399)][33158] | Unimplemented | Blocked on unresolved questions |
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| T-lang | [`:vis` macro matcher][41022] | Implemented | Blocked on `crate` becoming a keyword |
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| T-lang | [`?` macro repetition][48075] | Implemented | Blocked on decision around edition dependent behaviour |
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| T-lang | [`?` operator and `catch` expressions (RFC 243, `question_mark`)][31436] | Implemented | Blocked on reservation of `try` operator. |
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| T-lang | [`asm` (inline assembly)][29722] | Implemented | Blocked on unclear stability guarantees |
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| T-lang | [`box_patterns`][29641] | Implemented | Blocked on `box_syntax` feature |
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| T-lang | [`cfg_target_vendor`][29718] | Implemented | Blocked on decision for stabilisation |
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| T-lang | [`custom_attribute` & `rustc_attrs`][29642] | Unimplemented | Blocked on decision for deprecation or stabilisation |
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| T-lang | [`custom_derive`][29644] | Deprecated | Blocked on rocket for removal |
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| T-lang | [`illegal_floating_point_literal_pattern` compatibility lint][41620] | Implemented | Blocked on making the lint deny by default |
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| T-lang | [`impl Trait` (RFC 1522, RFC 1951, RFC 2071)][34511] | Implementation in progress | Blocked elision, error messages, and `abstract type` |
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| T-lang | [`invalid_type_param_default` compatibility lint][36887] | Implemented | Blocked on making the lint a hard error |
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| T-lang | [`legacy_constructor_visibility` compatibility lint][39207] | Implemented | Blocked on making the lint a hard error |
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| T-lang | [`literal` fragment specifier (RFC 1576)][35625] | Implemented | Waiting on 1.28.0 stable release |
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| T-lang | [`private_in_public` compatibility lint.][34537] | Implemented | Blocked on PR to make lint deny by default |
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| T-lang | [`resolve_trait_on_defaulted_unit` compatibility lint][39216] | Implemented | Blocked on making the lint a hard error |
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| T-lang | [`safe_extern_statics` compatibility lint][36247] | Implemented | Blocked on making the lint a hard error |
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| T-lang | [`use $crate;` compatibility warning][37390] | Implemented | Blocked on making the lint deny by default |
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| T-lang | [`{Range, RangeFrom, RangeTo}::contains`][32311] | Implemented | Blocked on [unresolved questions][range_questions] |
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| T-lang | | [`associated_type_defaults`][29661] | Unimplemented | Blocked on decision on deprecation or semantic change |
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| T-libes | [Specialization (RFC 1210)][31844] | Implemented | Blocked on restrictions of lifetime dispatch |
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| T-libs | [API convention for blocking-, timeout-, and/or deadline-related functions][46316] | Unimplemented | Blocked on FCP |
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| T-libs | [Add `is_empty` function to `ExactSizeIterator`][35428] | Unimplemented | Blocked on unresolved design decisions |
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| T-libs | [Adding more atomic integer types][32976] | Implementation in progress | Blocked on atomic `128` bit integers. |
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| T-libs | [Allow a `HashMap` and `BTreeMap` entry to be replaced.][44286] | Implemented | Blocked on decision to stabilise |
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| T-libs | [Cell::update][50186] | Implemented | Blocked on unresolved questions |
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| T-libs | [Custom allocators in standard collections][42774] | Implementation in progress | Blocked on [#47043] and [#50882] |
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| T-libs | [IP constructors][44582] | Implementation in progress | Blocked on moving the implementation to use associated consts |
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| T-libs | [Integer methods for Wrapping][32463] | Implementation in progress | Some methods are still missing implementations. |
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| T-libs | [Path/PathBuf normalization methods][47402] | Unimplemented | Blocked on implementation |
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| T-libs | [Pluggable panic implementations (RFC 1513)][32837] | Unimplemented | Blocked on unresolved design decisions |
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| T-libs | [RFC 2045: improving `#[target_feature]`][44839] | Implemented | Blocked on documentation and stabilisation |
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| T-libs | [Reversing the bit pattern in an integer][48763] | Implemented | Blocked on decision to stabilise |
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| T-libs | [Tracking Issue: Duration::{as_nanos, as_micros, as_millis}][50202] | Implemented | Blocked on decision to stable |
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| T-libs | [TrustedLen (`trusted_len`)][37572] | Implemented | Blocked on specialisation |
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| T-libs | [TryFrom/TryInto traits][33417] | Implemented | Blocked on the `!`/never type |
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| T-libs | [UnicodeVersion and UNICODE_VERSION][49726] | Implemented | Blocked on concerns on whether updating const values is a breaking change |
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| T-libs | [Vec::remove_item][40062] | Implemented | Blocked on unresolved concerns |
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| T-libs | [Vec::resize_default][41758] | Implemented | Blocked on decision to stabilise |
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| T-libs | [`Box::into_raw_non_null`][47336] | Implemented | Blocked on decision to stabilise |
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| T-libs | [`Read::initializer`][42788] | Implemented | Blocked on design decisions |
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| T-libs | [`Result<Option>` and `Option<Result>` Conversion][47338] | Implemented | Blocked on unresolved questions |
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| T-libs | [`ToOwned::clone_into`][41263] | Implemented | Blocked on concerns |
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| T-libs | [`Vec::drain_filter` and `LinkedList::drain_filter`][43244] | Implemented | Blocked on design decisions |
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| T-libs | [`exact_chunks,exact_chunks_mut`][47115] | Implemented | Blocked on unresolved questions |
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| T-libs | [`ops::Try`][42327] | Implemented? | Unclear on what is required next |
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| T-libs | [`ptr::offset_to`][41079] | Deprecated | Blocked on removal |
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| T-libs | [`std::io::{set_panic, set_print}`][31343] | Implemented | Blocked on decision to stabilise |
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| T-libs | [`step_trait` stabilization][42168] | Implementation in progress | Blocked on replacement methods and `TrustedLen` |
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| T-libs | [`sync::Once` poisoning][33577] | Implemented | Blocked on inactivity |
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| T-libs | [write_all_at/read_exact_at convenience methods ][51984] | Implemented | Blocked on decision to stabilise |
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[29639]: https://github.com/rust-lang/rust/issues/29639
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[29635]: https://github.com/rust-lang/rust/issues/29635
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[29641]: https://github.com/rust-lang/rust/issues/29641
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[29642]: https://github.com/rust-lang/rust/issues/29642
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[29644]: https://github.com/rust-lang/rust/issues/29644
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[29661]: https://github.com/rust-lang/rust/issues/29661
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[29718]: https://github.com/rust-lang/rust/issues/29718
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[29722]: https://github.com/rust-lang/rust/issues/29722
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[29864]: https://github.com/rust-lang/rust/issues/29864
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[30450]: https://github.com/rust-lang/rust/issues/30450
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[31343]: https://github.com/rust-lang/rust/issues/31343
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[31436]: https://github.com/rust-lang/rust/issues/31436
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[31844]: https://github.com/rust-lang/rust/issues/31844
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[32311]: https://github.com/rust-lang/rust/issues/32311
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[32408]: https://github.com/rust-lang/rust/issues/32408
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[32463]: https://github.com/rust-lang/rust/issues/32463
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[32836]: https://github.com/rust-lang/rust/issues/32836
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[32837]: https://github.com/rust-lang/rust/issues/32837
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[32838]: https://github.com/rust-lang/rust/issues/32838
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[32976]: https://github.com/rust-lang/rust/issues/32976
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[33017]: https://github.com/rust-lang/rust/issues/33017
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[33158]: https://github.com/rust-lang/rust/issues/33158
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[33417]: https://github.com/rust-lang/rust/issues/33417
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[33577]: https://github.com/rust-lang/rust/issues/33577
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[34303]: https://github.com/rust-lang/rust/issues/34303
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[34511]: https://github.com/rust-lang/rust/issues/34511
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[34537]: https://github.com/rust-lang/rust/issues/34537
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[34761]: https://github.com/rust-lang/rust/issues/34761
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[34981]: https://github.com/rust-lang/rust/issues/34981
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[35118]: https://github.com/rust-lang/rust/issues/35118
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[35121]: https://github.com/rust-lang/rust/issues/35121
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[35203]: https://github.com/rust-lang/rust/issues/35203
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[35428]: https://github.com/rust-lang/rust/issues/35428
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[35625]: https://github.com/rust-lang/rust/issues/35625
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[35896]: https://github.com/rust-lang/rust/issues/35896
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[36247]: https://github.com/rust-lang/rust/issues/36247
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[36887]: https://github.com/rust-lang/rust/issues/36887
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[37390]: https://github.com/rust-lang/rust/issues/37390
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[37403]: https://github.com/rust-lang/rust/issues/37403
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[37572]: https://github.com/rust-lang/rust/issues/37572
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[37854]: https://github.com/rust-lang/rust/issues/37854
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[37872]: https://github.com/rust-lang/rust/issues/37872
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[38338]: https://github.com/rust-lang/rust/issues/38338
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[38356]: https://github.com/rust-lang/rust/issues/38356
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[38487]: https://github.com/rust-lang/rust/issues/38487
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[38788]: https://github.com/rust-lang/rust/issues/38788
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[38864]: https://github.com/rust-lang/rust/issues/38864
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[39207]: https://github.com/rust-lang/rust/issues/39207
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[39216]: https://github.com/rust-lang/rust/issues/39216
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[39412]: https://github.com/rust-lang/rust/issues/39412
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[39699]: https://github.com/rust-lang/rust/issues/39699
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[40062]: https://github.com/rust-lang/rust/issues/40062
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[40180]: https://github.com/rust-lang/rust/issues/40180
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[40289]: https://github.com/rust-lang/rust/issues/40289
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[40582]: https://github.com/rust-lang/rust/issues/40582
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[41022]: https://github.com/rust-lang/rust/issues/41022
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[41079]: https://github.com/rust-lang/rust/issues/41079
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[41263]: https://github.com/rust-lang/rust/issues/41263
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[41517]: https://github.com/rust-lang/rust/issues/41517
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[41574]: https://github.com/rust-lang/rust/issues/41574
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[41620]: https://github.com/rust-lang/rust/issues/41620
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[41758]: https://github.com/rust-lang/rust/issues/41758
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[42168]: https://github.com/rust-lang/rust/issues/42168
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[42202]: https://github.com/rust-lang/rust/issues/42202
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[42238]: https://github.com/rust-lang/rust/issues/42238
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[42326]: https://github.com/rust-lang/rust/issues/42326
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[42327]: https://github.com/rust-lang/rust/issues/42327
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[42524]: https://github.com/rust-lang/rust/issues/42524
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[42774]: https://github.com/rust-lang/rust/issues/42774
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[42788]: https://github.com/rust-lang/rust/issues/42788
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[42877]: https://github.com/rust-lang/rust/issues/42877
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[43244]: https://github.com/rust-lang/rust/issues/43244
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[43561]: https://github.com/rust-lang/rust/issues/43561
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[43606]: https://github.com/rust-lang/rust/issues/43606
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[44265]: https://github.com/rust-lang/rust/issues/44265
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[44286]: https://github.com/rust-lang/rust/issues/44286
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[44582]: https://github.com/rust-lang/rust/issues/44582
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[44839]: https://github.com/rust-lang/rust/issues/44839
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[44874]: https://github.com/rust-lang/rust/issues/44874
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[46043]: https://github.com/rust-lang/rust/issues/46043
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[46205]: https://github.com/rust-lang/rust/issues/46205
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[46316]: https://github.com/rust-lang/rust/issues/46316
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[47115]: https://github.com/rust-lang/rust/issues/47115
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[47336]: https://github.com/rust-lang/rust/issues/47336
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[47338]: https://github.com/rust-lang/rust/issues/47338
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[47402]: https://github.com/rust-lang/rust/issues/47402
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[48075]: https://github.com/rust-lang/rust/issues/48075
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[48763]: https://github.com/rust-lang/rust/issues/48763
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[49359]: https://github.com/rust-lang/rust/issues/49359
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[49726]: https://github.com/rust-lang/rust/issues/49726
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[50186]: https://github.com/rust-lang/rust/issues/50186
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[50202]: https://github.com/rust-lang/rust/issues/50202
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[50512]: https://github.com/rust-lang/rust/issues/50512
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[50907]: https://github.com/rust-lang/rust/issues/50907
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[51085]: https://github.com/rust-lang/rust/issues/51085
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[51087]: https://github.com/rust-lang/rust/issues/51087
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[51088]: https://github.com/rust-lang/rust/issues/51088
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[51443]: https://github.com/rust-lang/rust/issues/51443
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[51984]: https://github.com/rust-lang/rust/issues/51984
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[52090]: https://github.com/rust-lang/rust/issues/52090
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[range_questions]: https://github.com/rust-lang/rust/issues/32311#issuecomment-312388435
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[#35237]: https://github.com/rust-lang/rust/issues/35237
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[#47043]: https://github.com/rust-lang/rust/issues/47043
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[#50882]: https://github.com/rust-lang/rust/issues/50882
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