GHC Handbook

Note [inlineId magic]

GHC/Core/Opt/ConstantFold.hs:2593 compiler 

The call 'inline f' arranges that 'f' is inlined, regardless of
its size. More precisely, the call 'inline f' rewrites to the
right-hand side of 'f's definition. This allows the programmer to
control inlining from a particular call site rather than the
definition site of the function.

The moving parts are simple:

* A very simple definition in the library base:GHC.Magic
     {-# NOINLINE[0] inline #

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