Add sym::size_hint

Author: DanielEScherzer

clippy_lints/src/iter_missing_exact_size.rs

@@ -1,5 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::paths::{PathNS, lookup_path_str};
+use clippy_utils::sym as clippy_sym;
 use clippy_utils::ty::{get_field_by_name, implements_trait, ty_from_hir_ty};
 use rustc_errors::MultiSpan;
 use rustc_hir::{Body, ExprKind, Impl, ImplItemKind, Item, ItemKind, OwnerId, OwnerNode};
@@ -107,7 +108,7 @@ fn size_hint_body<'tcx>(cx: &LateContext<'tcx>, owner_id: OwnerId) -> Option<&'t
         .find(|assoc_item| {
             assoc_item.expect_trait_impl().is_ok()
                 && assoc_item.is_method()
-                && assoc_item.name().as_str() == "size_hint"
+                && assoc_item.name() == clippy_sym::size_hint
         })?;
 
     let node = cx.tcx.expect_hir_owner_node(size_hint_fn.def_id.expect_local());
@@ -151,7 +152,7 @@ impl<'tcx> LateLintPass<'tcx> for IterMissingExactSize {
             && block.stmts.is_empty()
             && let Some(trailing_expr) = block.expr
             && let ExprKind::MethodCall(method_name, receiver, args, _) = trailing_expr.kind
-            && method_name.ident.as_str() == "size_hint"
+            && method_name.ident.name == clippy_sym::size_hint
             && let ExprKind::Field(_object, field_name) = receiver.kind
             && args.is_empty()
         {

clippy_utils/src/sym.rs

@@ -545,6 +545,7 @@ generate! {
     set_readonly,
     signum,
     single_component_path_imports,
+    size_hint,
     skip,
     skip_while,
     slice_from_ref,