Concise method body + type inference ?

[Brian Goetz]

> I wonder if the concise method body proposal should not be extended to add parameters types/return type inference in case of overriding methods.

In LVTI, we drew a bright line between inference in implementations and 
inference in declarations, for a good reason.  Clever observers 
commented that "but you could safely use `var` to infer the return type 
of a private method, without inviting API instability", but we declined 
on the basis that the incremental complexity of the rules (having a 
coupling between accessibility and inference) was not justified by the 
incremental expressiveness.  The current rules restrict inference to 
local variables, which is nice and clean and orthogonal.  I would make 
the same argument for not introducing a similar coupling here.