@resumable breaks blocks scope

[Krastanov]

Base Julia and ResumableFunctions.@resumable treat let blocks (and potentially others) differently

julia> function f()
           i = 1
           let j=i
               val = j
           end
           return val
       end
       f()
ERROR: UndefVarError: `val` not defined
Stacktrace:
 [1] f()
   @ Main ./REPL[114]:6
 [2] top-level scope
   @ REPL[114]:8

julia> @resumable function g()
           i = 1
           let j=i
               val = j
           end
           @yield val
       end
       collect(g())
1-element Vector{Any}:
 1

[Krastanov]

and of course this is not only with let:

julia> @resumable function h()
           for i in 1:10
           end
           @yield i
       end
h (generic function with 1 method)

julia> collect(h())
1-element Vector{Any}:
 10

julia> function h1()
           for i in 1:10
           end
           return i
       end
h1 (generic function with 1 method)

julia> h1()
ERROR: UndefVarError: `i` not defined
Stacktrace:
 [1] h1()
   @ Main ./REPL[134]:4
 [2] top-level scope
   @ REPL[135]:1

[Krastanov]

discussion from slack on this topic: