message: StarlarkStr is not SimpleValue
  Summary: Dead code.
diff: @@ -37,8 +37,8 @@ use crate::{
  environment::{Globals, GlobalsStatic},
  values::{
  index::apply_slice, string::repr::string_repr, AllocFrozenValue, AllocValue, ComplexValue,
  - Freezer, FrozenHeap, FrozenValue, Heap, SimpleValue, StarlarkValue, Trace, UnpackValue,
  - Value, ValueError, ValueLike,
  + Freezer, FrozenHeap, FrozenValue, Heap, StarlarkValue, Trace, UnpackValue, Value,
  + ValueError, ValueLike,
  },
  };
  @@ -206,8 +206,6 @@ pub(crate) fn json_escape(x: &str) -> String {
  unsafe { String::from_utf8_unchecked(escaped) }
  }
  -impl SimpleValue for StarlarkStr {}
  -
  impl Display for StarlarkStr {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  // We could either accumulate straight into the buffer (can't preallocate, virtual call on each character)
  