Top rust issues

[control flow analysis] Special treatment for `Err( )?`

A-typesystem C-feature-request T-lang

impl dyn for AnyType fails to compile

A-edition-2018-lints A-parser T-compiler WG-epoch regression-from-stable-to-stable

build an empty project failed (undefined reference to `__onexitbegin')

A-linkage C-bug O-windows-gnu T-compiler

make the epoch Enable All The Things

C-tracking-issue T-compiler T-lang WG-epoch

Performance regressions of compiled code over the last year

A-libtest C-enhancement I-slow P-medium T-compiler regression-from-stable-to-stable

Confusing "type parameter" in error message.

A-diagnostics C-enhancement D-newcomer-roadblock E-mentor T-compiler

Optimize enums by niche-filling even when the smaller variants also have data.

A-codegen A-layout C-enhancement T-compiler

`FnOnce` doesn't seem to support type-based dispatch (as `Add`, etc. do)

C-enhancement E-mentor T-lang

LLVM: Memcpy-memcpy dependence isn't detected across basic blocks

A-LLVM C-enhancement I-slow T-compiler

seg fault pushing on either side of a VecDeque

C-bug I-unsound 💥 P-high T-libs