OpEquals in Dmd

[Lucian Danescu]

Hello everyone!

I thought I'd ask before diving straight into an implementation. 
I am using dmd as a library and I have a use case where being 
able to compare AST nodes would be really helpful.

My question is: is this doable in DMD, or is it a reason it 
hasn't been implemented so far? Do you guys consider it would be 
a valuable addition to DMD, or it wouldn't go through?