message: impl Trace for DocString
diff: @@ -22,13 +22,15 @@ use once_cell::sync::Lazy;
  use regex::Regex;
  use serde::{Deserialize, Serialize};
  +use crate as starlark;
  use crate::{
  codemap::Spanned,
  syntax::ast::{AstLiteral, AstPayload, AstStmtP, ExprP, StmtP},
  + values::Trace,
  };
  /// The documentation provided by a user for a specific module, object, function, etc.
  -#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
  +#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Trace)]
  pub struct DocString {
  /// The first line of a doc string. This has whitespace trimmed from it.
  pub summary: String,
  