Auto merge of #6601 - mdm:fix-unit-args-false-positive, r=camsteffen

[rust.git] / clippy_lints / src / inherent_impl.rs

diff --git a/clippy_lints/src/inherent_impl.rs b/clippy_lints/src/inherent_impl.rs
index 063aade4e7f875332367c6b266068daec39f7aaf..005c461f105e60a7e3f4582788572d84cd81547b 100644 (file)
--- a/clippy_lints/src/inherent_impl.rs
+++ b/clippy_lints/src/inherent_impl.rs
@@ -1,11 +1,11 @@
 //! lint on inherent implementations
 
 use crate::utils::{in_macro, span_lint_and_then};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, impl_lint_pass};
 use rustc_data_structures::fx::FxHashMap;
-use syntax_pos::Span;
+use rustc_hir::{def_id, Crate, Impl, Item, ItemKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::Span;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for multiple inherent implementations of a struct
@@ -47,38 +47,38 @@ pub struct MultipleInherentImpl {
 
 impl_lint_pass!(MultipleInherentImpl => [MULTIPLE_INHERENT_IMPL]);
 
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MultipleInherentImpl {
-    fn check_item(&mut self, _: &LateContext<'a, 'tcx>, item: &'tcx Item) {
-        if let ItemKind::Impl(_, _, _, ref generics, None, _, _) = item.kind {
-            // Remember for each inherent implementation encoutered its span and generics
+impl<'tcx> LateLintPass<'tcx> for MultipleInherentImpl {
+    fn check_item(&mut self, _: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+        if let ItemKind::Impl(Impl {
+            ref generics,
+            of_trait: None,
+            ..
+        }) = item.kind
+        {
+            // Remember for each inherent implementation encountered its span and generics
             // but filter out implementations that have generic params (type or lifetime)
             // or are derived from a macro
-            if !in_macro(item.span) && generics.params.len() == 0 {
-                self.impls.insert(item.hir_id.owner_def_id(), item.span);
+            if !in_macro(item.span) && generics.params.is_empty() {
+                self.impls.insert(item.def_id.to_def_id(), item.span);
             }
         }
     }
 
-    fn check_crate_post(&mut self, cx: &LateContext<'a, 'tcx>, krate: &'tcx Crate) {
-        if let Some(item) = krate.items.values().nth(0) {
+    fn check_crate_post(&mut self, cx: &LateContext<'tcx>, krate: &'tcx Crate<'_>) {
+        if !krate.items.is_empty() {
             // Retrieve all inherent implementations from the crate, grouped by type
-            for impls in cx
-                .tcx
-                .crate_inherent_impls(item.hir_id.owner_def_id().krate)
-                .inherent_impls
-                .values()
-            {
+            for impls in cx.tcx.crate_inherent_impls(def_id::LOCAL_CRATE).inherent_impls.values() {
                 // Filter out implementations that have generic params (type or lifetime)
                 let mut impl_spans = impls.iter().filter_map(|impl_def| self.impls.get(impl_def));
-                if let Some(initial_span) = impl_spans.nth(0) {
+                if let Some(initial_span) = impl_spans.next() {
                     impl_spans.for_each(|additional_span| {
                         span_lint_and_then(
                             cx,
                             MULTIPLE_INHERENT_IMPL,
                             *additional_span,
-                            "Multiple implementations of this structure",
-                            |db| {
-                                db.span_note(*initial_span, "First implementation here");
+                            "multiple implementations of this structure",
+                            |diag| {
+                                diag.span_note(*initial_span, "first implementation here");
                             },
                         )
                     })