"""
`f` from page `a.jl`.

Links:

- [`deepcopy`](@ref)
- [`while`](@ref)
- [`@eval(x)`](@ref)
- [`T(x)`](@ref)
- [`T(x, y)`](@ref)
- [`f(::Integer)`](@ref)
- [`f(::Any)`](@ref)
- [`f(::Any, ::Any)`](@ref)
- [`f(x, y, z)`](@ref)

[^footnote]:

    Footnote contents. [^footnote]

"""
f(x) = x
