That's because of the CSE (common subexpression elimination) pass. Here's an
example:
module Lib where
foo :: a -> a
foo x = x
bar :: a -> a
bar x = x
Build with -O -ddump-stg and you'll see something like:
Lib.foo :: forall a. a -> a
[GblId, Arity=1,
Hi devs,
I just found that the Cmm code of `GHC.Base.id` refers to `breakpoint`
in the same module, however, in the Haskell source of `GHC.Base`, the
definition of `id` and `breakpoint` are totally unrelated:
```
id :: a -> a
id x= x
breakpoint :: a ->
