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Subteam report: compiler 2016-03-11

Highlights

The biggest news is that eddyb has been pushing hard on improving the backend of the compiler lately. PRs #31710 and #32080 have simultaneously cleaned up a lot of the compiler code, closed some long-standing bugs, and pushed MIR almost to the point of viability. For this reason, I am nominating @eddyb for Friend of the Tree this week!

--nmatsakis

Dashboard

RFC phase

  • PR #1399: RFC: Add #[repr(pack = "N")]
  • PR #1414: Add Rvalue-static-promotion RFC
  • PR #1477: Generic atomic v2
  • PR #1478: translate undefined intrinsics to an unreachable and a lint
  • PR #1510: RFC: Add a new crate-type, rdylib

Implementation phase

  • Issue #5016: implement "dynamic drop" semantics using flags on the stack rather than zeroing
  • Issue #12634: Replace various intrinsic wrappers with intrinsic reexports
  • Issue #15023: Better temporary lifetimes (tracking issue for RFC 66)
  • Issue #15287: Implement Pattern Guards with Bind-By-Move
  • Issue #20561: Tracking issue for Consistent no-prelude attribute (RFC 501)
  • Issue #27060: repr(packed) allows invalid unaligned loads

High priority issues

  • Issue #15536: floating point to floating point casts have undefined behaviour
  • Issue #22889: Duplicate inherent static methods can be defined in separate impl blocks
  • Issue #29149: Lifetime bounds in Copy impls are ignored
  • Issue #29859: Cyclic traits allow arbitrary traits to be synthesized
  • Issue #30829: Code no longer builds because of RFC 1214
  • Issue #31299: Bogus error in beta and nightly: recursive type has infinite size
  • Issue #31567: Drop and leaking &mut references
  • Issue #31804: Rustc does not stop on error.

Needs decision
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