Merge commit '37f4fbb929' into clippy-subtree-update

clippy_lints/src/unconditional_recursion.rs

@@ -16,6 +16,7 @@ use rustc_session::impl_lint_pass;
 use rustc_span::symbol::{kw, Ident};
 use rustc_span::{sym, Span};
 use rustc_trait_selection::error_reporting::traits::suggestions::ReturnsVisitor;
+use std::ops::ControlFlow;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -276,7 +277,6 @@ struct CheckCalls<'a, 'tcx> {
     cx: &'a LateContext<'tcx>,
     map: Map<'tcx>,
     implemented_ty_id: DefId,
-    found_default_call: bool,
     method_span: Span,
 }
 
@@ -285,16 +285,14 @@ where
     'tcx: 'a,
 {
     type NestedFilter = nested_filter::OnlyBodies;
+    type Result = ControlFlow<()>;
 
     fn nested_visit_map(&mut self) -> Self::Map {
         self.map
     }
 
-    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
-        if self.found_default_call {
-            return;
-        }
-        walk_expr(self, expr);
+    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) -> ControlFlow<()> {
+        walk_expr(self, expr)?;
 
         if let ExprKind::Call(f, _) = expr.kind
             && let ExprKind::Path(qpath) = f.kind
@@ -303,9 +301,10 @@ where
             && let Some(trait_def_id) = self.cx.tcx.trait_of_item(method_def_id)
             && self.cx.tcx.is_diagnostic_item(sym::Default, trait_def_id)
         {
-            self.found_default_call = true;
             span_error(self.cx, self.method_span, expr);
+            return ControlFlow::Break(());
         }
+        ControlFlow::Continue(())
     }
 }
 
@@ -383,7 +382,6 @@ impl UnconditionalRecursion {
                 cx,
                 map: cx.tcx.hir(),
                 implemented_ty_id,
-                found_default_call: false,
                 method_span,
             };
             walk_body(&mut c, body);