Function should be allowed as type

[triwav]

If you type a param as Function like here: https://github.com/briandunnington/roku-promise/blob/master/Promise.brs#L40
You receive the warning:
Function parameter 'callback' is of invalid type 'function'

This also seems to mess up subsequent code as I get:
Found unexpected token 'end function'
on the outer function end statement

[TwitchBronBron]

Just to add some clarity, here's a simplified example showing the issue.

Source

sub Main()
   doWork = function(callback as function)
   end function
end sub

[sjbarag]

I could have sworn I had a test case that accepted a callback function, but it turns out I never provided as function 😓

Sorry about that @triwav!