message: Add fuzzer-found test case to unit-tests.
  This test case is found to be fixed by fuzz-testing framework.
diff: @@ -2918,6 +2918,11 @@ const TreeUnwrapperTestData kDescriptionTestCases[] = {
  "a;",
  L(0, {"a", ";"}),
  },
  + {
  + "implicit-type data declaration, singleton, with var keyword",
  + "\t var a;",
  + L(0, {"var", "a", ";"}),
  + },
  {
  "two implicit-type data declaration",
  "a;b;",
  @@ -2931,6 +2936,15 @@ const TreeUnwrapperTestData kDescriptionTestCases[] = {
  L(0, {"a", ","}), //
  L(0, {"b", ";"})),
  },
  + {
  + "implicit-type data declaration, two variables, with var keyword",
  + "var a,b;",
  + DataDeclaration(0, //
  + L(0, {"var"}), //
  + N(2, //
  + L(2, {"a", ","}), //
  + L(2, {"b", ";"}))),
  + },
  {
  "one bind declaration",
  "bind foo bar#(.x(y)) baz(.clk(clk));",
  