T23540 is fragile on i386
Over the past few weeks, T23540 has been fragile on i386, failing on multiple MRs and relevant marge pipelines. An incomplete list of victims:
It is unclear at this point why T23540 worked on i386 in the past but starts failing only on i386 when you change some ghc frontend internals. It may be related to the unique fragility again (another instance of #24261 (closed)), and while 615eb855 was sufficient to prevent T23540 regression on !11530 (closed) !11973 (closed), it wasn't sufficient to prevent the error from surfacing in !11983 (closed).
This issue tracks the T23540 fragility on i386. To avoid blocking work on other fronts, while we look into it further, I'll land a patch that marks it fragile.