Exceptions and lambda.

Maurizio Cimadamore maurizio.cimadamore at oracle.com
Wed Feb 6 05:33:58 PST 2013

On 06/02/13 13:03, Maurizio Cimadamore wrote:
> On 06/02/13 12:51, Srikanth S Adayapalam wrote:
>> I couldn't find some text that explicitly
>> forbids the scenario we are talking about (where types are elided and 
>> inferred and
>> there is no further need to refer to any type variables) 
> I think I cannot find it either - I think it should be in 15.27.3 Type 
> of a Lambda Expression' - Dan?
> Maurizio
The only bit about this that I could find is the discussion section in 
9.8 (bullet 4).

It would seem that the text is implying that the restriction comes from 
the fact that a lambda has no syntax for declaring type-parameters. On 
the other hand I'm not sure that's enough, as the compiler could simply 
generate a signature that matches the one in the functional descriptor 
so that overriding is preserved (esp. when lambda formals are omitted).

If parameters are explcit, it's a different story, as the check that 
enforces that lambda parameter types should match types in the 
functional descriptor is mostly enough to guarantee that a lambda will 
not be compatible with a generic functional descriptor. I said mostly 
because if the descriptor doesn't mention type-variables in the argument 
part, then the check doesn't help and we're back to square one.

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