Inference failure for splatting numbers

This fails on at least 0.5.2, 0.6.0-rc2, and master: 

```julia
julia> wrap(ind) = (ind...)
wrap (generic function with 1 method)

julia> wrap(1)
(1,)

julia> using Base.Test

julia> @inferred(wrap(1))
ERROR: return type Tuple{Int64} does not match inferred return type Tuple{Vararg{Int64,N} where N}
Stacktrace:
 [1] error(::String) at ./error.jl:21
```

Fix coming momentarily.
