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Subteam report: lang 2016-02-01

Highlights

This week we discussed and made decisions on several nominated issues and PRs, including:

We reached a basic decision on the ?/try/catch RFC, which is that we plan to merge the RFC. However, there remains some bikeshedding to be done, so we will have one more week of FCP to sort out the keywords:

We moved two features into final comment period (FCP) for stabilization in Rust 1.8:

  • FCP Issue #28235: Tracking issue for overloaded += operators (RFC 953) (feature augmented_assignments)
  • FCP Issue #29720: Tracking issue for braced_empty_structs (RFC 218)

Finally, we brought two RFCs into final comment period (FCP):

Dashboard

High priority issues

  • Issue #22889: Duplicate inherent static methods can be defined in separate impl blocks
  • Issue #25860: Implied bounds on nested references + variance = soundness hole
  • Issue #26775: extern crate is always treated as pub within the crate, but is not visible outside it; pub extern crate makes no difference
  • Issue #28514: Private trait's methods reachable through a public subtrait
  • Issue #29149: Lifetime bounds in Copy impls are ignored
  • Issue #29859: Cyclic traits allow arbitrary traits to be synthesized
  • Issue #30127: Desugared x.index(y) is not equivalent to x[y]

Issues needing a decision

  • Issue #21232: borrow-checker allows partial reinit of struct that has been moved away, but no use of it.
  • Issue #23818: print! macro should flush stdout

RFC phase

  • FCP PR #243: Trait-based exception handling
  • FCP PR #1129: IndexAssign: overloading the a[b] = c expression
  • FCP PR #1196: RFC for allowing eliding more type parameters.
  • FCP PR #1210: RFC: impl specialization
  • FCP PR #1445: Restrict constants in patterns
  • PR #197: ManuallyDrop type gives precise control of dtors of inline data.
  • PR #1062: Constants that depend on type parameters in generic code
  • PR #1148: Mutually exclusive traits
  • PR #1177: Anonymous/placeholder lifetime "'_".
  • PR #1180: Propose Interior<T> data-type, to allow moves out of the dropped value during the drop hook.
  • PR #1201: Add support for naked functions.
  • PR #1248: Safe intrinsics RFC
  • PR #1258: Add macros to get the values of configuration flags
  • PR #1296: RFC: Add an alias attribute to #[link] and -l
  • PR #1303: Add a let...else expression, similar to Swift's guard let...else
  • PR #1305: Abstract output type parameters
  • PR #1319: Amend RFC1228 with operator fixity and precedence
  • PR #1321: Unstable visibility RFC
  • PR #1327: Dropck Eyepatch RFC.
  • PR #1346: Unsafe expressions
  • PR #1358: RFC: Add #[repr(align = "N")]
  • PR #1373: Remove some kinds of doc comments
  • PR #1379: Change thread local variables to only accept async-signal-safe types.
  • PR #1398: Allocators, take III
  • PR #1399: RFC: Add #[repr(pack = "N")]
  • PR #1406: Rfc: delegation of implementation
  • PR #1408: Delayed resolution
  • PR #1414: Add Rvalue-static-promotion RFC
  • PR #1422: pub(restricted) item
  • PR #1426: Placement in/box refinement
  • PR #1429: Feature gate extern fn methods
  • PR #1431: Statically dispatched methods for trait objects with associated data
  • PR #1437: ESC byte escape
  • PR #1440: RFC - Allow Drop types in statics/const functions
  • PR #1444: RFC: native C-compatible unions via built-in syntax macro union!
  • PR #1449: Add language support for bitfields
  • PR #1450: Types for enum variants
  • PR #1459: Add a used attribute
  • PR #1477: Generic atomic v2
  • PR #1478: translate undefined intrinsics to an unreachable and a lint

Implementation phase

Stabilization phase
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