change lint type from style to perf

Author: kyoto7250

clippy_lints/src/lib.register_perf.rs

@@ -26,6 +26,7 @@ store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![
     LintId::of(slow_vector_initialization::SLOW_VECTOR_INITIALIZATION),
     LintId::of(types::BOX_COLLECTION),
     LintId::of(types::REDUNDANT_ALLOCATION),
+    LintId::of(use_retain::USE_RETAIN),
     LintId::of(vec::USELESS_VEC),
     LintId::of(vec_init_then_push::VEC_INIT_THEN_PUSH),
 ])

clippy_lints/src/lib.register_style.rs

@@ -117,7 +117,6 @@ store.register_group(true, "clippy::style", Some("clippy_style"), vec![
     LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
     LintId::of(unused_unit::UNUSED_UNIT),
     LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
-    LintId::of(use_retain::USE_RETAIN),
     LintId::of(write::PRINTLN_EMPTY_STRING),
     LintId::of(write::PRINT_LITERAL),
     LintId::of(write::PRINT_WITH_NEWLINE),

clippy_lints/src/use_retain.rs

@@ -43,7 +43,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.63.0"]
     pub USE_RETAIN,
-    style,
+    perf,
     "`retain()` is simpler and the same functionalitys"
 }
 declare_lint_pass!(UseRetain => [USE_RETAIN]);