pkg math/rand, func New(Source) *Rand
pkg math/rand, func NewSource(int64) Source
pkg math/rand, func NewZipf(*Rand, float64, float64, uint64) *Zipf
pkg math/rand, func NormFloat64() float64
pkg math/rand, func Perm(int) []int
pkg math/rand, func Seed(int64)
pkg math/rand, func Uint32() uint32
pkg math/rand, method (*Rand) ExpFloat64() float64
pkg math/rand, method (*Rand) Float32() float32

pkg regexp/syntax, const ErrInvalidEscape = "invalid escape sequence"
pkg regexp/syntax, const ErrInvalidNamedCapture = "invalid named capture"
pkg regexp/syntax, const ErrInvalidPerlOp = "invalid or unsupported Perl syntax"
pkg regexp/syntax, const ErrInvalidRepeatOp = "invalid nested repetition operator"
pkg regexp/syntax, const ErrInvalidRepeatSize = "invalid repeat count"
pkg regexp/syntax, const ErrInvalidUTF8 = "invalid UTF-8"