Point package:ghc

A variable which can be unified; alternately, this can be thought of as an equivalence class with a distinguished representative.
Breakpoint identifier. See Note [Breakpoint identifiers]
Internal breakpoint identifier See Note [Breakpoint identifiers]
the breakpoint we stopped at (Nothing = exception)
Should Cmm split proc points or not
A label associated with an UnwindTable
given the instruction sequence of a block, produce a list of the block's UnwindPoints See Note [What is this unwinding business?] in GHC.Cmm.DebugBlock and Note [Unwinding information in the NCG] in this module.