The problem is usually not syntaxes; the problem is a lot of Schemes don't have sufficient support for introspection, making a SLIME-type editor impossible. SL

The problem is usually not syntaxes; the problem is a lot of Schemes don't have sufficient support for introspection, making a SLIME-type editor impossible. SLIME is also heavily informed by its CL background and has historically been a clumsy fit at best with most Schemes. When I was doing a lot of PLT Scheme development for my thesis, I mostly used Quack and suffered; something like this would have been immensely welcome.