//! lint when there is an enum with no variants
-use crate::utils::span_lint_and_then;
-use rustc_hir::*;
+use crate::utils::span_lint_and_help;
+use rustc_hir::{Item, ItemKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_lint_pass!(EmptyEnum => [EMPTY_ENUM]);
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EmptyEnum {
- fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) {
+impl<'tcx> LateLintPass<'tcx> for EmptyEnum {
+ fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
let did = cx.tcx.hir().local_def_id(item.hir_id);
if let ItemKind::Enum(..) = item.kind {
let ty = cx.tcx.type_of(did);
let adt = ty.ty_adt_def().expect("already checked whether this is an enum");
if adt.variants.is_empty() {
- span_lint_and_then(cx, EMPTY_ENUM, item.span, "enum with no variants", |db| {
- db.span_help(
- item.span,
- "consider using the uninhabited type `!` (never type) or a wrapper \
- around it to introduce a type which can't be instantiated",
- );
- });
+ span_lint_and_help(
+ cx,
+ EMPTY_ENUM,
+ item.span,
+ "enum with no variants",
+ None,
+ "consider using the uninhabited type `!` (never type) or a wrapper \
+ around it to introduce a type which can't be instantiated",
+ );
}
}
}