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These proposals have shipped within their agreed scope, or completed the
experiment or investigation identified in their entry. They preserve design rationale and alternatives; the reference and
tutorial describe current behavior. Further extensions
listed below do not make the completed scope pending again. The
backlog remains the only work queue.
See the proposal index for partially implemented and unimplemented
designs and the policy for moving completed proposals.
Proposal Reference Further work
Boxed protocol objects Protocol objects Further protocol capabilities remain separate from the delivered erased-owner contract Positive and NonNegative integer domain types Numbers , std conventions B96 Bounded; issue #686 Single-file scripts Script runner B17/B18: wider executable-cache coverage Library-owned operations and backend hooks — investigation complete; no language changeProtocols , visibility B29; future default/final methods and private-hook grants belong to Protocol method bodies Fluent iterator pipelines Pipelines B75 extensions; related B12, B22, B24 Owned response experiment Field moves B72: real HTTP integration remains unexplored Flat class layout Value representations , memory B19 performance extensions; related B35 Runtime allocation audit Allocation and traps B13 References, ownership, and explicit copying Ownership B11 One immutable str with explicit lengths Text B12, B27 Sum types and enums Enums , matching B19, B33 Generics, structural protocols, context managers, and error propagation Generics , resource scopes B11, B14, B29 Native owned generators Generators Unscheduled Allocation-free generator frames and ranges Generators , ranges B12 Callable surface review Functions B32 Stored closure environments Consuming and stored closures B11, B32 Native concurrency contract Concurrency B13, B24, B28 Bounded channel implementation Channels Deferred B22 extensions Named arguments and fresh defaults Signatures and calls B36 refinements; unpacking remains separate Human-readable formatting and error reports std.reportentry reports B71 extensions; Failure remains a deliberate last resort Explicit error composition , with experiment and production evidence std.errorstd.io.typedstd.http.typedHTTP client B71 additive extensions and deferred benchmark-template migration Finite error sets as anonymous sums Anonymous sums , propagation B14/B71: guards, residual-set inference and empty sums Bundled HTTP acceptance HTTP qualification , client , server Preserve B66 gates; additional platforms and HTTP/2 or HTTP/3 are separate scope Explicit applications, modules, and executable lessons Entry point , modules , runnable documentation B17: re-exports and module caching; literate lesson sources not adopted Plenty’s next language phase , a design reviewPer topic in its outcome table B13, B23, and the extensions it lists Python slice syntax , with its implementation plan Slices B39: borrowed views &xs[a:b] (issue #581); issue #583 Checked arithmetic blocks Numbers Checked shifts and casts unscheduled; class patterns landed with issue #558 Rust compiler boundaries and measured performance — steps 1–6 and legacy-syntax removalFrontend , cache B17 compilation session; B19 module replay and frontend candidates