TVar package:breakpoint

Atomically update the reference. Does not force the evaluation of the new variable contents. For strict update, use atomicUpdMutVar'.

Strict variant of atomicUpdMutVar.

Filled in by renamer, the name used internally by the pattern

Sort the variables, putting type and covars first, in scoped order, and then other Ids It is a deterministic sort, meaning it doesn't look at the values of Uniques. For explanation why it's important See Note [Unique Determinism] in GHC.Types.Unique.