Top rust issues

No documentation on why packed types + Drop aren't UB

T-doc

Rust generates unaligned loads when unpacking an aligned struct

A-codegen T-compiler

Panic within a panic causes illegal instruction SIGILL

rustdoc repeats implementation 13 times

C-bug T-rustdoc

optimisation idea: look ahead to deduce better vector capacities

Setting opt-level = 3 will cause stage1-rustc to segfault on Linux

A-LLVM A-spurious C-bug T-compiler

[nightly regression] rustc incorrectly parses attributes as macro invocations in nightly-2018-08-18

A-macros A-resolve P-high T-lang regression-from-stable-to-nightly

Experiment with a hybrid bitfield + range encoding for Span / DefId.

A-incr-comp I-compilemem T-compiler

Existential type complains about private type in public interface if concrete type is not pub

A-impl-trait A-visibility

Tracking issue for tools build error: `duplicate artfacts found when compiling a tool`

C-enhancement T-infra