Inter-module inlining doesn't work, Id unfolding seems to be empty -- why?

[Erdi, Gergo]

PUBLIC

Hi,

The attached program uses the GHC 9.0.1 API to typecheck and compile a single module that contains a single definition marked as INLINE:

module Inline where

data A = A1 | A2
data B = B1 | B2

{-# INLINE f #-}
f :: A ->B
f A1 = B1
f A2 = B2

In my bigger program, I noticed that usages of `f` in another module aren't inlined, so I made the attached experiment: I compile this to desugared, simplified, tidied and prep'd Core, and then use updateModDetailsIdInfos to fill in the unfolding of `f`. At least, that's what I thought I do. However, if I print the unfolding of `f` after this process, I get `OtherCon []` instead of what I expected to be a CoreUnfolding. What am I doing wrong?

Thanks,
            Gergo

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