A more relevant point that would disqualify Haskell is the fact that its runtime (or rather, the GHC's runtime) is nowhere near predictable enough for the realtime guarantees that time synchronisation software would require.
A Haskell DSL that outputs some safer low-level code would be a more likely choice (for example http://hackage.haskell.org/package/atom), but Rust is both more popular and has more commercial support.