@transform and @select error on julia v0.6 about dataframesmeta.jl HOT 2 CLOSED

julia> using DataFrames
julia> using DataFramesMeta
julia> df = DataFrame(A = 1:3, B = [2, 1, 2])
3×2 DataFrames.DataFrame
│ Row │ A │ B │
├─────┼───┼───┤
│ 1   │ 1 │ 2 │
│ 2   │ 2 │ 1 │
│ 3   │ 3 │ 2 │

julia> @transform(df, a = 2 * :A, x = :A + :B)
3×4 DataFrames.DataFrame
│ Row │ A │ B │ a │ x │
├─────┼───┼───┼───┼───┤
│ 1   │ 1 │ 2 │ 2 │ 3 │
│ 2   │ 2 │ 1 │ 4 │ 3 │
│ 3   │ 3 │ 2 │ 6 │ 5 │

julia> Pkg.status.(["DataFramesMeta", "DataFrames"]);
 - DataFramesMeta                0.2.0
 - DataFrames                    0.10.1

julia> versioninfo()
Julia Version 0.6.0
Commit 903644385b (2017-06-19 13:05 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin13.4.0)
  CPU: Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, haswell)