var predeclaredConstants = map[string]bool{
	"false": true,
	"iota":  true,
	"nil":   true,
	"true":  true,
}

// assumedPackageName returns the assumed package name
// for a given import path. This is a copy of
// golang.org/x/tools/internal/imports.ImportPathToAssumedName.
func assumedPackageName(importPath string) string {
	notIdentifier := func(ch rune) bool {
		return !('a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' ||