message: refactor(es/compat): Respect MSRV
diff: @@ -353,10 +353,12 @@ impl<C: Comments> Actual<C> {
  wrapper.function = make_fn_ref(fn_expr);
  *expr = wrapper.into();
  - if !in_iife && let Some(c) = &mut self.comments {
  + if !in_iife {
  + if let Some(c) = &mut self.comments {
  c.add_pure_comment(expr.span().lo)
  }
  }
  + }
  Expr::Fn(
  fn_expr @ FnExpr {
  @@ -374,10 +376,12 @@ impl<C: Comments> Actual<C> {
  wrapper.function = make_fn_ref(fn_expr);
  *expr = wrapper.into();
  - if !in_iife && let Some(c) = &mut self.comments {
  + if !in_iife {
  + if let Some(c) = &mut self.comments {
  c.add_pure_comment(expr.span().lo)
  }
  }
  + }
  _ => {}
  }
  