message: export VAR exports local variables
diff: @@ -164,6 +164,11 @@ impl<'a> VariableStore for Shell<'a> {
  }
  }
  },
  + Err(AssignmentError::NoOperator) => for var in expression.split_whitespace() {
  + if let Some(value) = self.variables.get_var(var) {
  + env::set_var(var, value);
  + }
  + },
  Err(AssignmentError::NoKeys) => {
  let stdout = io::stdout();
  let stdout = &mut stdout.lock();
  