Allowing `e` of any type in `void f(...) => e` in the analyzer.

pkg/analyzer/test/generated/static_type_warning_code_test.dart

Index: pkg/analyzer/test/generated/static_type_warning_code_test.dart
diff --git a/pkg/analyzer/test/generated/static_type_warning_code_test.dart b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
index 3165c7692d2c6893f736e06a6b1189ba8ae76b27..d52d84aa5f8bb2ce98e8ee512bac2c8d71c3bde4 100644
--- a/pkg/analyzer/test/generated/static_type_warning_code_test.dart
+++ b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
@@ -1121,9 +1121,8 @@ class A {
         [StaticTypeWarningCode.RETURN_OF_INVALID_TYPE]);
   }
 
-  test_returnOfInvalidType_expressionFunctionBody_void() async {
-    await assertErrorsInCode(
-        "void f() => 42;", [StaticTypeWarningCode.RETURN_OF_INVALID_TYPE]);
+  test_returnOfInvalidType_not_issued_for_expressionFunctionBody_void() async {
+    await assertNoErrorsInCode("void f() => 42;");
   }
 
   test_returnOfInvalidType_function() async {