diff --git a/clippy_lints/src/casts/manual_dangling_ptr.rs b/clippy_lints/src/casts/manual_dangling_ptr.rs
index ff5320719aa2..be1f406770ce 100644
--- a/clippy_lints/src/casts/manual_dangling_ptr.rs
+++ b/clippy_lints/src/casts/manual_dangling_ptr.rs
@@ -1,6 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::res::{MaybeDef, MaybeResPath};
 use clippy_utils::source::SpanRangeExt;
-use clippy_utils::{expr_or_init, is_path_diagnostic_item, std_or_core, sym};
+use clippy_utils::{expr_or_init, std_or_core, sym};
 use rustc_ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, GenericArg, Mutability, QPath, Ty, TyKind};
@@ -53,7 +54,7 @@ fn is_expr_const_aligned(cx: &LateContext<'_>, expr: &Expr<'_>, to: &Ty<'_>) ->
 
 fn is_align_of_call(cx: &LateContext<'_>, fun: &Expr<'_>, to: &Ty<'_>) -> bool {
     if let ExprKind::Path(QPath::Resolved(_, path)) = fun.kind
-        && is_path_diagnostic_item(cx, fun, sym::mem_align_of)
+        && fun.basic_res().is_diag_item(cx, sym::mem_align_of)
         && let Some(args) = path.segments.last().and_then(|seg| seg.args)
         && let [GenericArg::Type(generic_ty)] = args.args
     {
diff --git a/clippy_lints/src/manual_option_as_slice.rs b/clippy_lints/src/manual_option_as_slice.rs
index b036e78cdedc..63f6d89f2ad7 100644
--- a/clippy_lints/src/manual_option_as_slice.rs
+++ b/clippy_lints/src/manual_option_as_slice.rs
@@ -1,6 +1,7 @@
 use clippy_config::Conf;
 use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
 use clippy_utils::msrvs::Msrv;
+use clippy_utils::res::{MaybeDef, MaybeQPath, MaybeResPath};
 use clippy_utils::{is_none_pattern, msrvs, peel_hir_expr_refs, sym};
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
@@ -189,7 +190,7 @@ fn check_arms(cx: &LateContext<'_>, none_arm: &Arm<'_>, some_arm: &Arm<'_>) -> b
 
 fn returns_empty_slice(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     match expr.kind {
-        ExprKind::Path(_) => clippy_utils::is_path_diagnostic_item(cx, expr, sym::default_fn),
+        ExprKind::Path(_) => expr.res(cx).is_diag_item(cx, sym::default_fn),
         ExprKind::Closure(cl) => is_empty_slice(cx, cx.tcx.hir_body(cl.body).value),
         _ => false,
     }
@@ -214,11 +215,11 @@ fn is_empty_slice(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
             _ => false,
         },
         ExprKind::Array([]) => true,
-        ExprKind::Call(def, []) => clippy_utils::is_path_diagnostic_item(cx, def, sym::default_fn),
+        ExprKind::Call(def, []) => def.res(cx).is_diag_item(cx, sym::default_fn),
         _ => false,
     }
 }
 
 fn is_slice_from_ref(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
-    clippy_utils::is_path_diagnostic_item(cx, expr, sym::slice_from_ref)
+    expr.basic_res().is_diag_item(cx, sym::slice_from_ref)
 }
diff --git a/clippy_lints/src/methods/from_iter_instead_of_collect.rs b/clippy_lints/src/methods/from_iter_instead_of_collect.rs
index d664eaaac704..11671f377e66 100644
--- a/clippy_lints/src/methods/from_iter_instead_of_collect.rs
+++ b/clippy_lints/src/methods/from_iter_instead_of_collect.rs
@@ -1,9 +1,10 @@
 use std::fmt::Write as _;
 
 use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::res::{MaybeDef, MaybeQPath};
 use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::sugg;
 use clippy_utils::ty::implements_trait;
-use clippy_utils::{is_path_diagnostic_item, sugg};
 use rustc_ast::join_path_idents;
 use rustc_errors::Applicability;
 use rustc_hir::def::Res;
@@ -15,7 +16,7 @@ use rustc_span::sym;
 use super::FROM_ITER_INSTEAD_OF_COLLECT;
 
 pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, args: &[Expr<'_>], func: &Expr<'_>) {
-    if is_path_diagnostic_item(cx, func, sym::from_iter_fn)
+    if func.res(cx).is_diag_item(cx, sym::from_iter_fn)
         && let arg_ty = cx.typeck_results().expr_ty(&args[0])
         && let Some(iter_id) = cx.tcx.get_diagnostic_item(sym::Iterator)
         && implements_trait(cx, arg_ty, iter_id, &[])
diff --git a/clippy_lints/src/methods/io_other_error.rs b/clippy_lints/src/methods/io_other_error.rs
index 9276261606e1..b081e804859a 100644
--- a/clippy_lints/src/methods/io_other_error.rs
+++ b/clippy_lints/src/methods/io_other_error.rs
@@ -1,6 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::msrvs::{self, Msrv};
-use clippy_utils::{expr_or_init, is_path_diagnostic_item, sym};
+use clippy_utils::res::{MaybeDef, MaybeQPath};
+use clippy_utils::{expr_or_init, sym};
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, QPath};
 use rustc_lint::LateContext;
@@ -10,7 +11,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, path: &Expr<'_>, args
         && !expr.span.from_expansion()
         && !error_kind.span.from_expansion()
         && let ExprKind::Path(QPath::TypeRelative(_, new_segment)) = path.kind
-        && is_path_diagnostic_item(cx, path, sym::io_error_new)
+        && path.ty_rel_def(cx).is_diag_item(cx, sym::io_error_new)
         && let ExprKind::Path(QPath::Resolved(_, init_path)) = &expr_or_init(cx, error_kind).kind
         && let [.., error_kind_ty, error_kind_variant] = init_path.segments
         && cx.tcx.is_diagnostic_item(sym::io_errorkind, error_kind_ty.res.def_id())
diff --git a/clippy_lints/src/methods/manual_str_repeat.rs b/clippy_lints/src/methods/manual_str_repeat.rs
index a811dd1cee18..7d6f56e4b31b 100644
--- a/clippy_lints/src/methods/manual_str_repeat.rs
+++ b/clippy_lints/src/methods/manual_str_repeat.rs
@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::is_path_diagnostic_item;
+use clippy_utils::res::{MaybeDef, MaybeResPath};
 use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
 use clippy_utils::sugg::Sugg;
 use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
@@ -55,7 +55,7 @@ pub(super) fn check(
     take_arg: &Expr<'_>,
 ) {
     if let ExprKind::Call(repeat_fn, [repeat_arg]) = take_self_arg.kind
-        && is_path_diagnostic_item(cx, repeat_fn, sym::iter_repeat)
+        && repeat_fn.basic_res().is_diag_item(cx, sym::iter_repeat)
         && is_type_lang_item(cx, cx.typeck_results().expr_ty(collect_expr), LangItem::String)
         && let Some(take_id) = cx.typeck_results().type_dependent_def_id(take_expr.hir_id)
         && let Some(iter_trait_id) = cx.tcx.get_diagnostic_item(sym::Iterator)
diff --git a/clippy_lints/src/methods/needless_character_iteration.rs b/clippy_lints/src/methods/needless_character_iteration.rs
index 71c1576cd57d..d161c002d083 100644
--- a/clippy_lints/src/methods/needless_character_iteration.rs
+++ b/clippy_lints/src/methods/needless_character_iteration.rs
@@ -1,3 +1,4 @@
+use clippy_utils::res::{MaybeDef, MaybeQPath};
 use rustc_errors::Applicability;
 use rustc_hir::{Closure, Expr, ExprKind, HirId, StmtKind, UnOp};
 use rustc_lint::LateContext;
@@ -8,7 +9,7 @@ use super::NEEDLESS_CHARACTER_ITERATION;
 use super::utils::get_last_chain_binding_hir_id;
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::SpanRangeExt;
-use clippy_utils::{is_path_diagnostic_item, path_to_local_id, peel_blocks, sym};
+use clippy_utils::{path_to_local_id, peel_blocks, sym};
 
 fn peels_expr_ref<'a, 'tcx>(mut expr: &'a Expr<'tcx>) -> &'a Expr<'tcx> {
     while let ExprKind::AddrOf(_, _, e) = expr.kind {
@@ -75,7 +76,7 @@ fn handle_expr(
             // If we have `!is_ascii`, then only `.any()` should warn. And if the condition is
             // `is_ascii`, then only `.all()` should warn.
             if revert != is_all
-                && is_path_diagnostic_item(cx, fn_path, sym::char_is_ascii)
+                && fn_path.ty_rel_def(cx).is_diag_item(cx, sym::char_is_ascii)
                 && path_to_local_id(peels_expr_ref(arg), first_param)
                 && let Some(snippet) = before_chars.get_source_text(cx)
             {
diff --git a/clippy_lints/src/methods/uninit_assumed_init.rs b/clippy_lints/src/methods/uninit_assumed_init.rs
index 6371fe644282..5e247a50358e 100644
--- a/clippy_lints/src/methods/uninit_assumed_init.rs
+++ b/clippy_lints/src/methods/uninit_assumed_init.rs
@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::is_path_diagnostic_item;
+use clippy_utils::res::{MaybeDef, MaybeQPath};
 use clippy_utils::ty::is_uninit_value_valid_for_ty;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -10,7 +10,7 @@ use super::UNINIT_ASSUMED_INIT;
 /// lint for `MaybeUninit::uninit().assume_init()` (we already have the latter)
 pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>) {
     if let hir::ExprKind::Call(callee, []) = recv.kind
-        && is_path_diagnostic_item(cx, callee, sym::maybe_uninit_uninit)
+        && callee.ty_rel_def(cx).is_diag_item(cx, sym::maybe_uninit_uninit)
         && !is_uninit_value_valid_for_ty(cx, cx.typeck_results().expr_ty_adjusted(expr))
     {
         span_lint(
diff --git a/clippy_lints/src/slow_vector_initialization.rs b/clippy_lints/src/slow_vector_initialization.rs
index f497d0700b8e..237c8e66ee3f 100644
--- a/clippy_lints/src/slow_vector_initialization.rs
+++ b/clippy_lints/src/slow_vector_initialization.rs
@@ -1,9 +1,9 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::macros::matching_root_macro_call;
+use clippy_utils::res::{MaybeDef, MaybeQPath, MaybeResPath};
 use clippy_utils::sugg::Sugg;
 use clippy_utils::{
-    SpanlessEq, get_enclosing_block, is_integer_literal, is_path_diagnostic_item, path_to_local, path_to_local_id,
-    span_contains_comment, sym,
+    SpanlessEq, get_enclosing_block, is_integer_literal, path_to_local, path_to_local_id, span_contains_comment, sym,
 };
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{Visitor, walk_block, walk_expr, walk_stmt};
@@ -149,10 +149,10 @@ impl SlowVectorInit {
         }
 
         if let ExprKind::Call(func, [len_expr]) = expr.kind
-            && is_path_diagnostic_item(cx, func, sym::vec_with_capacity)
+            && func.ty_rel_def(cx).is_diag_item(cx, sym::vec_with_capacity)
         {
             Some(InitializedSize::Initialized(len_expr))
-        } else if matches!(expr.kind, ExprKind::Call(func, []) if is_path_diagnostic_item(cx, func, sym::vec_new)) {
+        } else if matches!(expr.kind, ExprKind::Call(func, []) if func.ty_rel_def(cx).is_diag_item(cx, sym::vec_new)) {
             Some(InitializedSize::Uninitialized)
         } else {
             None
@@ -301,7 +301,7 @@ impl<'tcx> VectorInitializationVisitor<'_, 'tcx> {
     /// Returns `true` if given expression is `repeat(0)`
     fn is_repeat_zero(&self, expr: &Expr<'_>) -> bool {
         if let ExprKind::Call(fn_expr, [repeat_arg]) = expr.kind
-            && is_path_diagnostic_item(self.cx, fn_expr, sym::iter_repeat)
+            && fn_expr.basic_res().is_diag_item(self.cx, sym::iter_repeat)
             && is_integer_literal(repeat_arg, 0)
         {
             true
diff --git a/clippy_lints/src/time_subtraction.rs b/clippy_lints/src/time_subtraction.rs
index fde8c3d9a9a7..c25668817f8b 100644
--- a/clippy_lints/src/time_subtraction.rs
+++ b/clippy_lints/src/time_subtraction.rs
@@ -1,8 +1,9 @@
 use clippy_config::Conf;
 use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
 use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::res::{MaybeDef, MaybeTypeckRes};
 use clippy_utils::sugg::Sugg;
-use clippy_utils::{is_path_diagnostic_item, ty};
+use clippy_utils::ty;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
@@ -146,7 +147,7 @@ impl LateLintPass<'_> for UncheckedTimeSubtraction {
 
 fn is_instant_now_call(cx: &LateContext<'_>, expr_block: &'_ Expr<'_>) -> bool {
     if let ExprKind::Call(fn_expr, []) = expr_block.kind
-        && is_path_diagnostic_item(cx, fn_expr, sym::instant_now)
+        && cx.ty_based_def(fn_expr).is_diag_item(cx, sym::instant_now)
     {
         true
     } else {
diff --git a/clippy_lints/src/to_digit_is_some.rs b/clippy_lints/src/to_digit_is_some.rs
index 3e847543e1c1..7b90f20b6ba3 100644
--- a/clippy_lints/src/to_digit_is_some.rs
+++ b/clippy_lints/src/to_digit_is_some.rs
@@ -1,8 +1,9 @@
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::res::{MaybeDef, MaybeQPath};
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::{is_in_const_context, is_path_diagnostic_item, sym};
+use clippy_utils::{is_in_const_context, sym};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
@@ -62,7 +63,7 @@ impl<'tcx> LateLintPass<'tcx> for ToDigitIsSome {
                     }
                 },
                 hir::ExprKind::Call(to_digits_call, [char_arg, radix_arg]) => {
-                    if is_path_diagnostic_item(cx, to_digits_call, sym::char_to_digit) {
+                    if to_digits_call.ty_rel_def(cx).is_diag_item(cx, sym::char_to_digit) {
                         Some((false, char_arg, radix_arg))
                     } else {
                         None
diff --git a/clippy_lints/src/transmute/transmute_null_to_fn.rs b/clippy_lints/src/transmute/transmute_null_to_fn.rs
index 7acf3be51fb7..e109b1c50e22 100644
--- a/clippy_lints/src/transmute/transmute_null_to_fn.rs
+++ b/clippy_lints/src/transmute/transmute_null_to_fn.rs
@@ -1,6 +1,7 @@
 use clippy_utils::consts::{ConstEvalCtxt, Constant};
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::{is_integer_literal, is_path_diagnostic_item};
+use clippy_utils::is_integer_literal;
+use clippy_utils::res::{MaybeDef, MaybeResPath};
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty::Ty;
@@ -40,7 +41,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, arg: &'t
         },
         // Catching:
         // `std::mem::transmute(std::ptr::null::<i32>())`
-        ExprKind::Call(func1, []) if is_path_diagnostic_item(cx, func1, sym::ptr_null) => {
+        ExprKind::Call(func1, []) if func1.basic_res().is_diag_item(cx, sym::ptr_null) => {
             lint_expr(cx, expr);
             true
         },
diff --git a/clippy_lints/src/transmute/transmuting_null.rs b/clippy_lints/src/transmute/transmuting_null.rs
index 544014bd32b3..1a6262f2ff76 100644
--- a/clippy_lints/src/transmute/transmuting_null.rs
+++ b/clippy_lints/src/transmute/transmuting_null.rs
@@ -1,6 +1,7 @@
 use clippy_utils::consts::{ConstEvalCtxt, Constant};
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::{is_integer_literal, is_path_diagnostic_item};
+use clippy_utils::is_integer_literal;
+use clippy_utils::res::{MaybeDef, MaybeResPath};
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty::Ty;
@@ -35,7 +36,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, arg: &'t
     // Catching:
     // `std::mem::transmute(std::ptr::null::<i32>())`
     if let ExprKind::Call(func1, []) = arg.kind
-        && is_path_diagnostic_item(cx, func1, sym::ptr_null)
+        && func1.basic_res().is_diag_item(cx, sym::ptr_null)
     {
         span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
         return true;
diff --git a/clippy_lints/src/types/owned_cow.rs b/clippy_lints/src/types/owned_cow.rs
index 9d4d885bf6cd..0eef373be04e 100644
--- a/clippy_lints/src/types/owned_cow.rs
+++ b/clippy_lints/src/types/owned_cow.rs
@@ -34,7 +34,7 @@ fn replacement(cx: &LateContext<'_>, cty: &hir::Ty<'_>) -> Option<(Span, String)
     if cty.basic_res().is_lang_item(cx, hir::LangItem::String) {
         return Some((cty.span, "str".into()));
     }
-    if clippy_utils::is_path_diagnostic_item(cx, cty, sym::Vec) {
+    if cty.basic_res().is_diag_item(cx, sym::Vec) {
         return if let hir::TyKind::Path(hir::QPath::Resolved(_, path)) = cty.kind
             && let [.., last_seg] = path.segments
             && let Some(args) = last_seg.args
@@ -46,7 +46,7 @@ fn replacement(cx: &LateContext<'_>, cty: &hir::Ty<'_>) -> Option<(Span, String)
             None
         };
     }
-    if clippy_utils::is_path_diagnostic_item(cx, cty, sym::cstring_type) {
+    if cty.basic_res().is_diag_item(cx, sym::cstring_type) {
         return Some((
             cty.span,
             (if clippy_utils::is_no_std_crate(cx) {
@@ -59,7 +59,7 @@ fn replacement(cx: &LateContext<'_>, cty: &hir::Ty<'_>) -> Option<(Span, String)
     }
     // Neither OsString nor PathBuf are available outside std
     for (diag, repl) in [(sym::OsString, "std::ffi::OsStr"), (sym::PathBuf, "std::path::Path")] {
-        if clippy_utils::is_path_diagnostic_item(cx, cty, diag) {
+        if cty.basic_res().is_diag_item(cx, diag) {
             return Some((cty.span, repl.into()));
         }
     }
diff --git a/clippy_lints/src/utils/author.rs b/clippy_lints/src/utils/author.rs
index f25387b5e66c..0c388fbd4812 100644
--- a/clippy_lints/src/utils/author.rs
+++ b/clippy_lints/src/utils/author.rs
@@ -298,7 +298,7 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
             if let Some(lang) = self.cx.tcx.lang_items().from_def_id(id) {
                 chain!(self, "{path}.res(cx).is_lang_item(cx, LangItem::{}", lang.name());
             } else if let Some(name) = self.cx.tcx.get_diagnostic_name(id) {
-                chain!(self, "is_path_diagnostic_item(cx, {path}, sym::{name})");
+                chain!(self, "{path}.res(cx).is_diag_item(cx, sym::{name})");
             } else {
                 chain!(
                     self,
diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs
index e92373941dc1..a976c9a7dafe 100644
--- a/clippy_utils/src/lib.rs
+++ b/clippy_utils/src/lib.rs
@@ -438,16 +438,6 @@ pub fn qpath_generic_tys<'tcx>(qpath: &QPath<'tcx>) -> impl Iterator<Item = &'tc
         })
 }
 
-/// If `maybe_path` is a path node which resolves to an item, resolves it to a `DefId` and checks if
-/// it matches the given diagnostic item.
-pub fn is_path_diagnostic_item<'tcx>(
-    cx: &LateContext<'_>,
-    maybe_path: &impl MaybePath<'tcx>,
-    diag_item: Symbol,
-) -> bool {
-    path_def_id(cx, maybe_path).is_some_and(|id| cx.tcx.is_diagnostic_item(diag_item, id))
-}
-
 /// If the expression is a path to a local, returns the canonical `HirId` of the local.
 pub fn path_to_local(expr: &Expr<'_>) -> Option<HirId> {
     if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind
@@ -784,13 +774,13 @@ fn is_default_equivalent_from(cx: &LateContext<'_>, from_func: &Expr<'_>, arg: &
                 node: LitKind::Str(sym, _),
                 ..
             }) => return sym.is_empty() && ty.basic_res().is_lang_item(cx, LangItem::String),
-            ExprKind::Array([]) => return is_path_diagnostic_item(cx, ty, sym::Vec),
+            ExprKind::Array([]) => return ty.basic_res().is_diag_item(cx, sym::Vec),
             ExprKind::Repeat(_, len) => {
                 if let ConstArgKind::Anon(anon_const) = len.kind
                     && let ExprKind::Lit(const_lit) = cx.tcx.hir_body(anon_const.body).value.kind
                     && let LitKind::Int(v, _) = const_lit.node
                 {
-                    return v == 0 && is_path_diagnostic_item(cx, ty, sym::Vec);
+                    return v == 0 && ty.basic_res().is_diag_item(cx, sym::Vec);
                 }
             },
             _ => (),
diff --git a/tests/ui/author/blocks.stdout b/tests/ui/author/blocks.stdout
index e453299edbcf..ff9fe2425ff9 100644
--- a/tests/ui/author/blocks.stdout
+++ b/tests/ui/author/blocks.stdout
@@ -23,13 +23,13 @@ if let ExprKind::Block(block, None) = expr.kind
     && let StmtKind::Let(local) = block.stmts[0].kind
     && let Some(init) = local.init
     && let ExprKind::Call(func, args) = init.kind
-    && is_path_diagnostic_item(cx, func, sym::string_new)
+    && func.res(cx).is_diag_item(cx, sym::string_new)
     && args.is_empty()
     && let PatKind::Binding(BindingMode::NONE, _, name, None) = local.pat.kind
     && name.as_str() == "expr"
     && let Some(trailing_expr) = block.expr
     && let ExprKind::Call(func1, args1) = trailing_expr.kind
-    && is_path_diagnostic_item(cx, func1, sym::mem_drop)
+    && func1.res(cx).is_diag_item(cx, sym::mem_drop)
     && args1.len() == 1
 {
     // report your lint here
diff --git a/tests/ui/author/call.stdout b/tests/ui/author/call.stdout
index 2b179d45112e..024121b14f9b 100644
--- a/tests/ui/author/call.stdout
+++ b/tests/ui/author/call.stdout
@@ -1,7 +1,7 @@
 if let StmtKind::Let(local) = stmt.kind
     && let Some(init) = local.init
     && let ExprKind::Call(func, args) = init.kind
-    && is_path_diagnostic_item(cx, func, sym::cmp_min)
+    && func.res(cx).is_diag_item(cx, sym::cmp_min)
     && args.len() == 2
     && let ExprKind::Lit(ref lit) = args[0].kind
     && let LitKind::Int(3, LitIntType::Unsuffixed) = lit.node
diff --git a/tests/ui/author/issue_3849.stdout b/tests/ui/author/issue_3849.stdout
index f02ea5bf075f..b88058f974db 100644
--- a/tests/ui/author/issue_3849.stdout
+++ b/tests/ui/author/issue_3849.stdout
@@ -1,7 +1,7 @@
 if let StmtKind::Let(local) = stmt.kind
     && let Some(init) = local.init
     && let ExprKind::Call(func, args) = init.kind
-    && is_path_diagnostic_item(cx, func, sym::transmute)
+    && func.res(cx).is_diag_item(cx, sym::transmute)
     && args.len() == 1
     && let PatKind::Wild = local.pat.kind
 {