Lambda syntax for methods and functions

[bearophile]

Timon Gehr:

> IIRC Don said this shouldn't work since the context is not 
> actually known at compile time.

I remember Don saying similar things on some other usages of 
'enum'. If all this needs to become accepts-invalid errors, then 
dmd 2.065 seems a good moment to fix this messy situation. 
Suggestions from Walter/Andrei are welcome.

Bye,
bearophile