Prevent race condition on generalTypeSet. Fix for Issue #8 - Hang in intellisense or shutdown due to HashSet corruption. Two threads were modifying the HashSet, replaced with a ConcurrentDictionary<_, unit> because there's no ConcurrentSet.
Prevent race condition on generalTypeSet.
Fix for Issue #8 - Hang in intellisense or shutdown due to HashSet corruption.
Two threads were modifying the HashSet, replaced with a ConcurrentDictionary<_, unit> because there's no ConcurrentSet.

fsprojects/FSharp.Text.RegexProvider