uber-go / dig / 317

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Support Parameter Objects (#71)

This adds support for parameter objects to Dig. Parameter objects are arguments
to a constructor which contain zero or more fields that are the actual
dependencies for the constructor. Users opt-in for a struct to be interpreted
as a parameter object by embedding the `dig.Param` type into it.

    type Config struct {
        dig.Param

        In io.Reader
        Out io.Writer
    }

    func NewTransport(c Config) (*Transport, error) {
        // ..
    }

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