clippy_lints/src/types/option_option.rs

   1 use rustc_hir::{self as hir, def_id::DefId, QPath};
   2 use rustc_lint::LateContext;
   3 use rustc_span::symbol::sym;
   4
   5 use crate::utils::{is_ty_param_diagnostic_item, span_lint};
   6
   7 pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_>, def_id: DefId) -> bool {
   8     if cx.tcx.is_diagnostic_item(sym::option_type, def_id) {
   9         if is_ty_param_diagnostic_item(cx, qpath, sym::option_type).is_some() {
  10             span_lint(
  11                 cx,
  12                 super::OPTION_OPTION,
  13                 hir_ty.span,
  14                 "consider using `Option<T>` instead of `Option<Option<T>>` or a custom \
  15                                  enum if you need to distinguish all 3 cases",
  16             );
  17             return true;
  18         }
  19     }
  20     false
  21 }