Code gen doesn't import anonymous imports

[Blquinn]

When runinng wire or go generate anonymous imports such as:

import _ "github.com/lib/pq"

don't appear in generated code.

To Reproduce

Example code:

package main

import (
	"context"
	"fmt"

	"github.com/google/wire"
	"github.com/jmoiron/sqlx"
	_ "github.com/lib/pq"
)

var (
	ServiceContainer = wire.NewSet(NewDatabase)
)

func NewDatabase() *sqlx.DB {
	return sqlx.MustConnect("postgres", "host=localhost port=5432 user=ben password=password dbname=tapx sslmode=disable")
}

func initializeDB(ctx context.Context) (*sqlx.DB, error) {
	wire.Build(ServiceContainer)
	return &sqlx.DB{}, nil
}

func main() {
	c := context.Background()
	db, err := initializeDB(c)
	if err != nil {
		panic(err)
	}

	var s struct {
		I int `db:"num"`
	}
	err = db.Get(&s, "select 1 as num")
	if err != nil {
		panic(err)
	}
	fmt.Printf("got %d\n", s.I)
}

Then run wire

Expected behavior

Should generate code with the following imports:

import (
	"context"
	"fmt"

	"github.com/google/wire"
	"github.com/jmoiron/sqlx"
	_ "github.com/lib/pq"
)

Version

HEAD as of today

[zombiezen]

Thank you for the bug report! We'll try to fix this as soon as we can, but in the meantime, you can work around by adding the blank import to another file in the same package.

[doodlesbykumbi]

@zombiezen @Blquinn I've made a PR attempting to fix this. See ^