REPL output for subtype of Function

[kristoffer.carlsson]

julia> struct Foo <: Function end

julia> Base.show(io::IO, ::MIME"text/plain", ::Foo) = print(io, "Hello")

julia> Foo()
Hello

Show for supertype

I am trying to organize printing for a set of types the following way: a generic function returns a string representation, then show for the supertype just prints it. MWE: abstract type MyAbstractFun <: Function end Base.show(io::IO, f::MyAbstractFun) = println(io, representation(f)) struct One <: MyAbstractFun end (::One)(x) = x+1 representation(::One) = "just adds one" but then evaluating at the REPL (ie going through display) gives me the standard printing from Base, while show works correc…