Bad saving of interactively-defined function in tuple

[cstjean]

The function disappears from the tuple:

julia> using JLD2, FileIO

julia> f(x) = x+1
f (generic function with 1 method)

julia> save("test.jld2", "tuple", (f, :hello))

### New session

julia> using JLD2, FileIO

julia> load("test.jld2", "tuple")
(:hello,)

[simonster]

JLD2 does not currently attempt to serialize functions in a way that they can be reconstructed without the source having been loaded (see #13). But this should probably print a warning if f is undefined in the workspace instead of silently dropping it from the tuple.

[cstjean]

I expected it to be a ReconstructedType instead of dropped, as in:

using JLD2, FileIO

struct Foo
a
b
c
end

f() = 2

save("test.jld2", "val", Foo(vcat, f, Any[vcat, f]))

using JLD2, FileIO

struct Foo
a
b
c
end

load("test.jld2", "val")

> Foo(vcat, JLD2.ReconstructedTypes.###f#665(), Any[vcat, JLD2.ReconstructedTypes.###f#665()])

Another issue, perhaps unsolvable: saving Function[vcat, f] has a problem on reload, because ReconstructedTypes are not Function objects.

The ReconstructedTypes behaviour is great for saving and loading traces in TraceCalls.jl, thank you for JLD2. 👍