[parser] Add more tests for preparser variable tracking.

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 37b40e37ae3bb204d045b4531ff948c901cee7ad..161e1e75554e1182a0e1110d50043dd10b55dce1 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -8778,6 +8778,18 @@ TEST(NoPessimisticContextAllocation) {
       {"", "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},