[parser] Add more tests for preparser variable tracking.

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8760 matching lines @@
   } inners[] = {
       // Context allocating because we need to:
       {"", "my_var;", true},
       {"", "if (true) { let my_var; } my_var;", true},
       {"", "eval('foo');", true},
       {"", "function inner2() { my_var; }", true},
       {"", "function inner2() { eval('foo'); }", true},
       {"", "var {my_var : a} = {my_var};", true},
       {"", "let {my_var : a} = {my_var};", true},
       {"", "const {my_var : a} = {my_var};", true},
+      {"", "var [a, b = my_var] = [1, 2];", true},
+      {"", "var [a, b = my_var] = [1, 2]; my_var;", true},
+      {"", "let [a, b = my_var] = [1, 2];", true},
+      {"", "let [a, b = my_var] = [1, 2]; my_var;", true},
+      {"", "const [a, b = my_var] = [1, 2];", true},
+      {"", "const [a, b = my_var] = [1, 2]; my_var;", true},
+      {"", "var {a = my_var} = {}", true},
+      {"", "var {a: b = my_var} = {}", true},
+      {"", "let {a = my_var} = {}", true},
+      {"", "let {a: b = my_var} = {}", true},
+      {"", "const {a = my_var} = {}", true},
+      {"", "const {a: b = my_var} = {}", true},
       {"a = my_var", "", true},
       {"", "function inner2(a = my_var) { }", true},
       {"", "(a = my_var) => { }", true},
       {"{a} = {a: my_var}", "", true},
       {"", "function inner2({a} = {a: my_var}) { }", true},
       {"", "({a} = {a: my_var}) => { }", true},
       {"[a] = [my_var]", "", true},
       {"", "function inner2([a] = [my_var]) { }", true},
       {"", "([a] = [my_var]) => { }", true},
       {"", "function inner2(a = eval('')) { }", true},
@@ skipping 371 matching lines @@
         eager_info.literal()->scope()->inner_scope()->inner_scope();
     DCHECK_NOT_NULL(scope);
     DCHECK_NULL(scope->sibling());
     DCHECK(scope->is_function_scope());
 
     size_t index = 0;
     i::ScopeTestHelper::CompareScopeToData(
         scope, lazy_info.preparsed_scope_data(), index);
   }
 }