#13104: runRW# ruins join points -------------------------------------+------------------------------------- Reporter: lukemaurer | Owner: chessai Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by sgraf): Replying to [comment:19 simonpj]:
So yes, either known-key or wired-in `Id`. We need wired-in if we need IdInfo that won't be inferred; but actually I think the right strictness ''will'' be inferred from its definition, so maybe known-key is enough.
Ah, right. I thought I checked this and expected `runRW#`'s strictness
signature to be present in the interface file for `GHC.Exts`, but it
wasn't, so I assumed it got special treatment, like wired-in things.
It turns out that `f` in the this program
{{{
{-# LANGUAGE MagicHash #-}
module Foo where
import GHC.Magic
f = runRW#
}}}
has the right strictness signature `