Feature request: detect and suggest discards in tuple deconstruction

[IanKemp]

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Code along these lines:

var (foo, bar, quux) = MethodThatReturnsATwoTuple();

foo.DoSomething();
// bar is never used and could be discarded
quux.AnotherThing();

could be rewritten as:

var (foo, _, quux) = MethodThatReturnsATwoTuple();

foo.DoSomething();
quux.AnotherThing();