Do not compute type_of for impl item if impl where clauses are unsatisfied

Author: compiler-errors

compiler/rustc_next_trait_solver/src/solve/normalizes_to/mod.rs

@@ -194,6 +194,8 @@ where
                 .map(|pred| goal.with(cx, pred));
             ecx.add_goals(GoalSource::ImplWhereBound, where_clause_bounds);
 
+            ecx.try_evaluate_added_goals()?;
+
             // Add GAT where clauses from the trait's definition.
             // FIXME: We don't need these, since these are the type's own WF obligations.
             ecx.add_goals(

tests/ui/async-await/in-trait/cycle-if-impl-doesnt-apply.rs

@@ -0,0 +1,35 @@
+//@ check-pass
+//@ revisions: current next
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@[next] compile-flags: -Znext-solver
+//@ edition: 2024
+
+use std::future::Future;
+
+trait Handler {}
+
+struct W<T>(T);
+
+trait SendTarget {
+    fn call(self) -> impl Future<Output = ()> + Send;
+}
+
+impl<T> SendTarget for W<T>
+where
+    T: Handler + Send,
+{
+    async fn call(self) {
+        todo!()
+    }
+}
+
+impl<T> SendTarget for T
+where
+    T: Handler + Send,
+{
+    async fn call(self) {
+        W(self).call().await
+    }
+}
+
+fn main() {}