GC.malloc is pure - wat

[Adam D. Ruppe via Digitalmars-d]

string toLower(string s);

Should that be pure? Repeated calls to it, given the same input, 
will return the same output, but they will also most likely be 
separately allocated.

GC.malloc might be cheating to be pure, but it does enable a lot 
of more logically pure stuff on top of it...