message: Don't expose the interpolation
  Summary: Not required at the moment, and I suspect it might not be for a while, or ever. There are 2 forms of interpolation, a 3rd planned, so no point exposing the least favoured one.
diff: //! https://github.com/google/skylark/blob/a0e5de7e63b47e716cca7226662a4c95d47bf873/doc/spec.md#sequence-types).
  //! We also use the term _container_ for denoting any of those type that can
  //! hold several values.
  -pub use crate::values::{
  - error::*, interpolation::*, iter::*, layout::*, owned::*, traits::*, types::*, unpack::*,
  -};
  +pub use crate::values::{error::*, iter::*, layout::*, owned::*, traits::*, types::*, unpack::*};
  use crate::{
  collections::{Hashed, SmallHashResult},
  values::types::function::FunctionInvoker,
  