`@resumable` functions do not support `where` type specifications

[gasagna]

This code

using ResumableFunctions

f(x) = 0.5*x*(x-1)

@resumable function foo(x::T) where {T}
    for i = 1:10
        @yield x
        x = f(x)
    end
    x
end

results in

ERROR: LoadError: UndefVarError: T not defined
Stacktrace:
 [1] include_from_node1(::String) at ./loading.jl:576
 [2] include(::String) at ./sysimg.jl:14
 [3] process_options(::Base.JLOptions) at ./client.jl:305
 [4] _start() at ./client.jl:371
while loading ../tests.jl, in expression starting on line 32

This issue is not blocking openjournals/joss-reviews#400 to be accepted, but at least it should be mentioned in the caveats. In the long term, supporting where type specifications would be a very useful feature to have.

[gasagna]

I now see in the readme that parametric resumable functions are not currently supported. Apologies. This could go in the docs as well. How hard is to implement this functionality?

[BenLauwens]

I am waiting for a new release of Macrotools to implement this functionality. I have only to change the type definition and the constructor but this is fairly trivial once where is completely supported in Macrotools. I have added a todo section to the docs.

[BenLauwens]

Parametric resumable functions are available now in the master branch. Further testing is however needed.

[BenLauwens]

Feature is working and all tests are successful. When the docs are updated, I will do a new release and close this issue.

[BenLauwens]

Feature supported in v0.1.8