Top rust issues

Tracking issue for box_syntax

B-unstable C-tracking-issue T-lang

Tracking issue: rfc 1990 - add external doc attribute to rustc

A-attributes B-unstable C-tracking-issue P-medium T-dev-tools T-lang T-rustdoc

Error code list which need to be updated to new format

A-diagnostics C-tracking-issue E-easy E-mentor metabug

Tracking issue for RFC #1909: Unsized Rvalues

B-RFC-approved C-tracking-issue F-unsized_locals T-lang

Can't cross compile from Linux to Windows (i686)

A-cross C-bug

#[derive] sometimes uses incorrect bounds

A-syntaxext C-feature-request P-low T-lang

Teach rustc to do tail calls

A-LLVM

Tracking issue for "Lazy normalization"

A-const-generics A-lazy-normalization A-traits A-typesystem C-tracking-issue T-compiler T-lang WG-compiler-traits

Fuchsia's target_family should be None, not "unix"

O-fuchsia T-compiler

Tracking issue for `illegal_floating_point_literal_pattern` compatibility lint

B-unstable C-future-compatibility T-lang