check stalled coroutine obligations eagerly

compiler/rustc_borrowck/src/lib.rs

@@ -121,6 +121,11 @@ fn mir_borrowck(
     let (input_body, _) = tcx.mir_promoted(def);
     debug!("run query mir_borrowck: {}", tcx.def_path_str(def));
 
+    // We should eagerly check stalled coroutine obligations from HIR typeck.
+    // Not doing so leads to silent normalization failures later, which will
+    // fail to register opaque types in the next solver.
+    tcx.check_coroutine_obligations(def)?;
+
     let input_body: &Body<'_> = &input_body.borrow();
     if let Some(guar) = input_body.tainted_by_errors {
         debug!("Skipping borrowck because of tainted body");