Failures to inline because callee references a builtin that
is shadowed by caller.

-- go.mod --
module testdata
go 1.12

-- a/nil.go --
package a

func _() {
	const nil = 1
	_ = f() //@ inline(re"f", re"nil.*shadowed.*by.*const.*line 4")
}

func f() *int { return nil }

-- a/append.go --
package a

func _() {
	type append int
	g(nil) //@ inline(re"g", re"append.*shadowed.*by.*typename.*line 4")
}

func g(x []int) { _ = append(x, x...) }

-- a/type.go --
package a

func _() {
	type int uint8
	_ = h(0) //@ inline(re"h", re"int.*shadowed.*by.*typename.*line 4")
}

func h(x int) int { return x + 1 }
