Fails on UnionAlls

[oxinabox]

julia> about(Vector)
UnionAllERROR: type UnionAll has no field name
Stacktrace:
 [1] getproperty
   @ ./Base.jl:43 [inlined]
 [2] about(io::Base.TTY, type::Type)
   @ About ~/.julia/packages/About/XPN7V/src/types.jl:48
 [3] about(x::Type)
   @ About ~/.julia/packages/About/XPN7V/src/About.jl:24
 [4] top-level scope
   @ REPL[12]:1

I had been hoping it would tell me what type parameters it had and what restrictions are on them.
We have code that does something like that in
https://github.com/invenia/ExprTools.jl/blob/bcc7765a177f39363dfcc9d9310c97ca26530a78/src/method.jl#L163-L174

[tecosaur]

Thanks for this issue! I think it would be neat to incorporate functionality like that.

Would it take much effort for you to provide a sample "this is what I liked to see" output I can look at to complement the code you linked? I'm thinking the two together should help me give this a shot.

[oxinabox]

Consider a struct:

struct Foo{X<:Integer, Y}
    x::X
    y::Y
    z::Int64
end

I would like to see

UnionAll defined in Main,
  Foo{X<:Integer, Y} <: Any

Struct with 3 fields:
• x  X
• y  Y 
• z  Int64

[tecosaur]

Recent changes seem to have this working, but perhaps with some room for improvement

julia> about(Vector)
UnionAll defined in Core, 
  Vector <: DenseVector <: AbstractVector <: Any

Struct with 2 fields:
• ref::MemoryRef    
• size::Tuple{Int64}

julia> about(Foo)
UnionAll defined in Main, 
  Foo <: Any

Struct with 3 fields:
• x::Integer
• y::Any    
• z::Int64  

[tecosaur]

Here we go, how about this?

julia> about(Vector)
UnionAll defined in Core, 
  Array{T, 1} <: DenseArray{T, 1} <: AbstractArray{T, 1} <: Any

Struct with 2 fields:
• ref::MemoryRef    
• size::Tuple{Int64}

julia> about(Foo)
UnionAll defined in Main, 
  Foo{X<:Integer, Y} <: Any

Struct with 3 fields:
• x::Integer
• y::Any    
• z::Int64  

[oxinabox]

It is reasonable.
Its a little loss of information if the type-var is used in multiple places
but that may be acceptable

[tecosaur]

Well, I've just pushed that. Do let me know if you have any ideas for further improvement 🙂 For now, onto Memory and Strings...