obsolete version of dependent function being called

[stevengj]

I just noticed what seems to have been a resurgence of #265 or a similar problem in 0.6 master, in a context where it didn't appear before (hence a regression).

In IJulia, it calls show(io, "text/plain", x) to get the text representation of the execution result, so if a package or notebook overrides the 3-argument show it should display as such. However, this doesn't seem to be happening anymore. If I make a notebook with

type Foo; end
Base.show(io::IO, ::MIME"text/plain", x::Foo) = print(io, "got a Foo()")
Foo()

Then it displays simply as Foo(), corresponding to the default show for composite types.

The reason that I think this is a related to #265 (or its resolution) is that I was able to work around it by calling eval (JuliaLang/IJulia.jl@3ed9573), using the same workaround as in #7884.

[vtjnash]

This is working as intended. There's no more "obsolute" methods now. In the old #265, you couldn't predict whether the old or new dispatch got called. But now you can: it'll just always call the old one 😃 0b8f0b7#diff-619ea7b9ee7c2fa87a3720c1361ba46cR396 (edit: fixed link since GitHub links to PR contents don't work)

[stevengj]

Thanks for the clarification! I'm still getting used to the new "world age" semantics.

It's really awkward to use eval with an expression to invoke the newest version of a function. Can we have some more convenient method to do invokenewest(function, args...)? See also #19774