BenchMaker: print call operators

Change-Id: I83560b19e3f3ce3b535bc5a69c953a8df6a5f668
Reviewed-on: https://dart-review.googlesource.com/c/93948
Reviewed-by: Jens Johansen <jensj@google.com>
diff --git a/pkg/front_end/tool/_fasta/bench_maker.dart b/pkg/front_end/tool/_fasta/bench_maker.dart
index 806dfb1..6eab1c3 100644
--- a/pkg/front_end/tool/_fasta/bench_maker.dart
+++ b/pkg/front_end/tool/_fasta/bench_maker.dart
@@ -111,8 +111,9 @@
       }
     }
     if (callOperator != null) {
-      // TODO(ahe): Write a function type here instead.
-      sb.write("{ call operator }");
+      sb.write("{ ");
+      callOperator.function.functionType.accept1(this, sb);
+      sb.write(" }");
     } else {
       sb.write(";");
     }