Propagate errors rather than using return_if_err

compiler/rustc_hir_typeck/src/upvar.rs

@@ -252,7 +252,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
         }
 
-        euv::ExprUseVisitor::new(
+        let _ = euv::ExprUseVisitor::new(
             &FnCtxt::new(self, self.tcx.param_env(closure_def_id), closure_def_id),
             &mut delegate,
         )

src/tools/clippy/clippy_lints/src/escape.rs

@@ -104,7 +104,7 @@ impl<'tcx> LateLintPass<'tcx> for BoxedLocal {
             too_large_for_stack: self.too_large_for_stack,
         };
 
-        ExprUseVisitor::for_clippy(cx, fn_def_id, &mut v).consume_body(body);
+        ExprUseVisitor::for_clippy(cx, fn_def_id, &mut v).consume_body(body).into_ok();
 
         for node in v.set {
             span_lint_hir(

src/tools/clippy/clippy_lints/src/lib.rs

@@ -8,6 +8,7 @@
 #![feature(never_type)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]
+#![feature(unwrap_infallible)]
 #![recursion_limit = "512"]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![allow(

src/tools/clippy/clippy_lints/src/loops/mut_range_bound.rs

@@ -65,7 +65,7 @@ fn check_for_mutation(
         body.hir_id.owner.def_id,
         &mut delegate,
     )
-    .walk_expr(body);
+    .walk_expr(body).into_ok();
 
     delegate.mutation_span()
 }

src/tools/clippy/clippy_lints/src/methods/iter_overeager_cloned.rs

@@ -9,7 +9,6 @@ use rustc_lint::LateContext;
 use rustc_middle::mir::{FakeReadCause, Mutability};
 use rustc_middle::ty::{self, BorrowKind};
 use rustc_span::sym;
-use rustc_trait_selection::infer::TyCtxtInferExt;
 
 use super::ITER_OVEREAGER_CLONED;
 use crate::redundant_clone::REDUNDANT_CLONE;
@@ -75,7 +74,7 @@ pub(super) fn check<'tcx>(
                 closure.def_id,
                 &mut delegate,
             )
-            .consume_body(body);
+            .consume_body(body).into_ok();
 
             let mut to_be_discarded = false;
 

src/tools/clippy/clippy_lints/src/needless_pass_by_ref_mut.rs

@@ -117,7 +117,7 @@ fn check_closures<'tcx>(
             .associated_body()
             .map(|(_, body_id)| hir.body(body_id))
         {
-            euv::ExprUseVisitor::for_clippy(cx, closure, &mut *ctx).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, closure, &mut *ctx).consume_body(body).into_ok();
         }
     }
 }
@@ -194,7 +194,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
                 async_closures: FxHashSet::default(),
                 tcx: cx.tcx,
             };
-            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx).consume_body(body).into_ok();
 
             let mut checked_closures = FxHashSet::default();
 

src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs

@@ -133,7 +133,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
         // function body.
         let MovedVariablesCtxt { moved_vars } = {
             let mut ctx = MovedVariablesCtxt::default();
-            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx).consume_body(body).into_ok();
             ctx
         };
 

src/tools/clippy/clippy_lints/src/operators/assign_op_pattern.rs

@@ -119,7 +119,7 @@ fn imm_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> HirIdSet {
 
     let mut s = S(HirIdSet::default());
     let v = ExprUseVisitor::for_clippy(cx, e.hir_id.owner.def_id, &mut s);
-    v.consume_expr(e);
+    v.consume_expr(e).into_ok();
     s.0
 }
 
@@ -144,6 +144,6 @@ fn mut_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> HirIdSet {
 
     let mut s = S(HirIdSet::default());
     let v = ExprUseVisitor::for_clippy(cx, e.hir_id.owner.def_id, &mut s);
-    v.consume_expr(e);
+    v.consume_expr(e).into_ok();
     s.0
 }

src/tools/clippy/clippy_lints/src/unwrap.rs

@@ -256,8 +256,8 @@ impl<'a, 'tcx> UnwrappableVariablesVisitor<'a, 'tcx> {
                 cond.hir_id.owner.def_id,
                 &mut delegate,
             );
-            vis.walk_expr(cond);
-            vis.walk_expr(branch);
+            vis.walk_expr(cond).into_ok();
+            vis.walk_expr(branch).into_ok();
 
             if delegate.is_mutated {
                 // if the variable is mutated, we don't know whether it can be unwrapped.

src/tools/clippy/clippy_utils/src/lib.rs

@@ -7,6 +7,7 @@
 #![feature(never_type)]
 #![feature(rustc_private)]
 #![feature(assert_matches)]
+#![feature(unwrap_infallible)]
 #![recursion_limit = "512"]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![allow(

src/tools/clippy/clippy_utils/src/sugg.rs

@@ -830,7 +830,9 @@ pub fn deref_closure_args(cx: &LateContext<'_>, closure: &hir::Expr<'_>) -> Opti
             applicability: Applicability::MachineApplicable,
         };
 
-        ExprUseVisitor::for_clippy(cx, def_id, &mut visitor).consume_body(closure_body);
+        ExprUseVisitor::for_clippy(cx, def_id, &mut visitor)
+            .consume_body(closure_body)
+            .into_ok();
 
         if !visitor.suggestion_start.is_empty() {
             return Some(DerefClosure {

src/tools/clippy/clippy_utils/src/usage.rs

@@ -21,7 +21,8 @@ pub fn mutated_variables<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) ->
         expr.hir_id.owner.def_id,
         &mut delegate,
     )
-    .walk_expr(expr);
+    .walk_expr(expr)
+    .into_ok();
 
     if delegate.skip {
         return None;

tests/ui/async-await/async-closures/ambiguous-arg.rs

@@ -0,0 +1,15 @@
+//@ edition:2021
+
+// Regression test for #123901. We previously ICE'd as we silently
+// swallowed an in the `ExprUseVisitor`.
+
+#![feature(async_closure)]
+
+pub fn test(test: &u64, temp: &u64) {
+    async |check, a, b| {
+        //~^ ERROR type annotations needed
+        temp.abs_diff(12);
+    };
+}
+
+fn main() {}

tests/ui/async-await/async-closures/ambiguous-arg.stderr

@@ -0,0 +1,13 @@
+error[E0282]: type annotations needed
+  --> $DIR/ambiguous-arg.rs:9:25
+   |
+LL |       async |check, a, b| {
+   |  _________________________^
+LL | |
+LL | |         temp.abs_diff(12);
+LL | |     };
+   | |_____^ cannot infer type
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0282`.