parameter type inference for anonymous functions in assignments

Here is one possible use case

shared Object bar(Request req, Response res) => "Hello";
shared Object baz(Request req, Response res) => "World ";
// ...
//vs
shared alias Route => Object(Request, Response);
shared Route bar = (req, res) => "Hello";
shared Route baz = (req, res) => "World";
// ...

[fwgreen]

@gavinking I cloned it again and this time it works! Thanks!

[gavinking]

This is now basically done, on the 6615 branch.