From 18a44116b866ebf5171b16d917c09dfd44a8fd36 Mon Sep 17 00:00:00 2001
From: Camille GILLOT <gillot.camille@gmail.com>
Date: Fri, 15 Apr 2022 19:27:53 +0200
Subject: [PATCH] Stop using CRATE_DEF_INDEX.

`CRATE_DEF_ID` and `CrateNum::as_def_id` are almost always what we want.
---
 clippy_lints/src/missing_doc.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/clippy_lints/src/missing_doc.rs b/clippy_lints/src/missing_doc.rs
index fc0483a92..5816a95dc 100644
--- a/clippy_lints/src/missing_doc.rs
+++ b/clippy_lints/src/missing_doc.rs
@@ -10,7 +10,7 @@ use clippy_utils::diagnostics::span_lint;
 use rustc_ast::ast;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::ty;
+use rustc_middle::ty::{self, DefIdTree};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::def_id::CRATE_DEF_ID;
 use rustc_span::source_map::Span;
@@ -114,8 +114,8 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
             hir::ItemKind::Fn(..) => {
                 // ignore main()
                 if it.ident.name == sym::main {
-                    let def_key = cx.tcx.hir().def_key(it.def_id);
-                    if def_key.parent == Some(hir::def_id::CRATE_DEF_INDEX) {
+                    let at_root = cx.tcx.local_parent(it.def_id) == Some(CRATE_DEF_ID);
+                    if at_root {
                         return;
                     }
                 }