This test performs basic coverage of 'rename' within a single package.

-- basic.go --
package p

func f(x int) { println(x) } //@rename("x", y, xToy)

-- @xToy/basic.go --
package p

func f(y int) { println(y) } //@rename("x", y, xToy)

-- alias.go --
package p

// from golang/go#61625
type LongNameHere struct{}
type A = LongNameHere //@rename("A", B, AToB)
func Foo() A

-- @AToB/alias.go --
package p

// from golang/go#61625
type LongNameHere struct{}
type B = LongNameHere //@rename("A", B, AToB)
func Foo() B

-- errors.go --
package p

func _(x []int) { //@renameerr("_", blank, `can't rename "_"`)
	x = append(x, 1) //@renameerr("append", blank, "built in and cannot be renamed")
	x = nil //@renameerr("nil", blank, "built in and cannot be renamed")
	x = nil //@renameerr("x", x, "old and new names are the same: x")
	_ = 1 //@renameerr("1", x, "no identifier found")
}