ast/hir: Rename field-related structures

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

diff --git a/clippy_lints/src/unused_io_amount.rs b/clippy_lints/src/unused_io_amount.rs
index 5f4b5fd9dd91cb2c3942e8923435188065c655a7..43166d26787a71258ab4c615e4d641f5b4ed50f1 100644 (file)
--- a/clippy_lints/src/unused_io_amount.rs
+++ b/clippy_lints/src/unused_io_amount.rs
@@ -1,4 +1,4 @@
-use crate::utils::{is_try, match_qpath, match_trait_method, paths, span_lint};
+use crate::utils::{is_try, match_trait_method, paths, span_lint};
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -32,8 +32,8 @@
 
 declare_lint_pass!(UnusedIoAmount => [UNUSED_IO_AMOUNT]);
 
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnusedIoAmount {
-    fn check_stmt(&mut self, cx: &LateContext<'_, '_>, s: &hir::Stmt<'_>) {
+impl<'tcx> LateLintPass<'tcx> for UnusedIoAmount {
+    fn check_stmt(&mut self, cx: &LateContext<'_>, s: &hir::Stmt<'_>) {
         let expr = match s.kind {
             hir::StmtKind::Semi(ref expr) | hir::StmtKind::Expr(ref expr) => &**expr,
             _ => return,
@@ -42,10 +42,11 @@ fn check_stmt(&mut self, cx: &LateContext<'_, '_>, s: &hir::Stmt<'_>) {
         match expr.kind {
             hir::ExprKind::Match(ref res, _, _) if is_try(expr).is_some() => {
                 if let hir::ExprKind::Call(ref func, ref args) = res.kind {
-                    if let hir::ExprKind::Path(ref path) = func.kind {
-                        if match_qpath(path, &paths::TRY_INTO_RESULT) && args.len() == 1 {
-                            check_method_call(cx, &args[0], expr);
-                        }
+                    if matches!(
+                        func.kind,
+                        hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::TryIntoResult, _))
+                    ) {
+                        check_method_call(cx, &args[0], expr);
                     }
                 } else {
                     check_method_call(cx, res, expr);
@@ -64,7 +65,7 @@ fn check_stmt(&mut self, cx: &LateContext<'_, '_>, s: &hir::Stmt<'_>) {
     }
 }
 
-fn check_method_call(cx: &LateContext<'_, '_>, call: &hir::Expr<'_>, expr: &hir::Expr<'_>) {
+fn check_method_call(cx: &LateContext<'_>, call: &hir::Expr<'_>, expr: &hir::Expr<'_>) {
     if let hir::ExprKind::MethodCall(ref path, _, _, _) = call.kind {
         let symbol = &*path.ident.as_str();
         let read_trait = match_trait_method(cx, call, &paths::IO_READ);