Some reserved words cannot be `?`d

[yurivish]

?abstract and ?type in the REPL both throw an error on 0.7, though ?struct and ?return and ?end and many others all print out helpful documentation.

help?> struct
search: struct mutable struct unsafe_trunc

  struct

  The most commonly used kind of type in Julia is a struct, specified as a
  name and a set of fields.

help?> abstract
ERROR: LoadError: Invalid @var syntax `incomplete: premature end of input`.
Stacktrace:
 [1] bindingexpr(::String) at ./docs/bindings.jl:17
 [2] docm(::LineNumberNode, ::Module, ::Expr) at ./docs/Docs.jl:736
 [3] @doc(::LineNumberNode, ::Module, ::Vararg{Any,N} where N) at ./boot.jl:406
in expression starting at docs/utils.jl:206

Update: Just learned from help mode autocomplete that abstract type works. Maybe this just needs an alias somewhere?

[KristofferC]

I think this will be automatically fixed when the deprecation for `abstract´ is removed.

Edit: Actually the deprecation is removed but abstract still doesn't parse as an identifier.