Bugfix + Feature Request for Compiler/Parser

[TobiasWienand]

Feature request from @brookate.

1. doesn't throw an error but compiles incorrectly
2. isn't supported yet

1. const [a0, a1] = f0(t);
2. const { prop1 } = obj.f();

Originally posted by @brookate in https://github.com/googleprojectzero/fuzzilli/issues/449#issuecomment-2421087587