Should fix the windows bots

Fix small typo in kinds documentation

If an enum type's only variant is private, disallow dereferencing
values of its type.

Due to #4082, this only applies to enums that are in the same crate.

r=pcwalton

Closes #818

libs: Remove transitionary material on iter_bytes, add workcache to buil...

Inheritance will be implemented differently, hopefully simpler

resolve wasn't checking that a `use` referred to a public item.

r=brson

Forbid item macros from occuring where statement macros might occur, and allow item macros to look like statement/expr macros.