expose option to not parse function bodies when calling parseCompilationUnit

pkg/analyzer/test/parse_compilation_unit_test.dart

Index: pkg/analyzer/test/parse_compilation_unit_test.dart
diff --git a/pkg/analyzer/test/parse_compilation_unit_test.dart b/pkg/analyzer/test/parse_compilation_unit_test.dart
index 756c2274d3f6018191d199b1e1dd34f4df729f46..c84b9553b360451de933c6c862e48129e0c29f6a 100644
--- a/pkg/analyzer/test/parse_compilation_unit_test.dart
+++ b/pkg/analyzer/test/parse_compilation_unit_test.dart
@@ -32,4 +32,10 @@ void main() {
           error.toString().contains("Error in <unknown source>: Expected to find ';'");
     })));
   });
+
+  test("allows you to specify whether or not to parse function bodies", () {
+    var unit = parseCompilationUnit(
+        "void main() => print('Hello, world!');", parseFunctionBodies: false);
+    expect(unit.toString(), equals("void main() ;"));
+  });
 }