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At a SPECIALSE pragma for an imported Id, we used to check that it was marked INLINABLE. But that turns out to interact badly with worker/wrapper: see Note [Worker-wrapper for INLINABLE functions] in GHC.Core.Opt.WorkWrap. So this small patch instead simply tests that we have an unfolding for the function; see Note [SPECIALISE pragmas for imported Ids] in GHC.Tc.Gen.Sig. Fixes #19246
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