message: Make Exports::contains non-mutable
diff: @@ -119,14 +119,12 @@ impl Exports {
  self.map.get(name)
  }
  - /// Returns true if the `Exports` contains the given name.
  - pub fn contains<S>(&mut self, name: S) -> bool
  + /// Returns true if the `Exports` contains the given export name.
  + pub fn contains<S>(&self, name: S) -> bool
  where
  S: Into<String>,
  {
  - Arc::get_mut(&mut self.map)
  - .unwrap()
  - .contains_key(&name.into())
  + self.map.contains_key(&name.into())
  }
  }
  