Set and map literals containing the same constant quoted and unquoted, will throw a duplicate key exception in some cases (the correct behaviour), while silently ignore the duplicate in some others.
`user=> #{'1 1}
{1}
user=> #{'[] []}
IllegalArgumentException Duplicate key: [] clojure.lang.PersistentHashSet.createWithCheck (PersistentHashSet.java:56)
`
This happens because the compiler assumes that literals that have distinct elements at read-time, will have distinct elements at runtime. This is not true for self-evaluating elements where (quote x) is equal to x
