Top rust issues

[RFC 2126] permit `foo.rs` or `foo/mod.rs` to support submodules like `foo/bar.rs`

E-mentor T-compiler WG-compiler-front

Phase out LLVM versions older than 3.9.

A-LLVM C-feature-request T-compiler T-infra

ICE: /checkout/src/librustc/ich/impls_ty.rs:78: TypeIdHasher: unexpected region ReLateBound(DebruijnIndex { depth: 1 }, "BrEnv")

A-incr-comp C-bug I-ICE

Nightly: unsafe code is allowed outside `unsafe` blocks when the code is unreachable

C-bug P-high T-compiler regression-from-stable-to-beta

Warn more gently on ignored example code

C-enhancement P-medium T-doc T-rustdoc

Tracking Issue for RFC 1826: Change the default URL of doc.rust-lang.org

B-RFC-approved C-tracking-issue P-medium T-doc

Tracking issue for String::splice

B-unstable C-tracking-issue T-libs final-comment-period

Tracking issue for RFC 2043: Add `align_offset` intrinsic (formerly: and `[T]::align_to` function)

B-RFC-approved C-tracking-issue T-libs disposition-merge finished-final-comment-period

Converting Vec<u16> to const * u8 makes binding call go haywire

Using LTO while building as static library causes conflicts

A-linkage C-bug T-compiler