[Issue 752] Assertion failure: 'e->type->ty != Ttuple' on line 4518 in file 'mtype.c'

[Walter Bright]

BCS wrote:
> It would be vary handy to be able to make a member of a tuple be a tuple 
> it's self. the perens might be a good way to denote this rather than the 
> usual flattening.

There's no way to do that with the current tuple semantics.