pkg os, method (*ProcessState) ExitCode() int
pkg os/exec, method (ExitError) ExitCode() int
pkg reflect, method (*MapIter) Key() Value
pkg reflect, method (*MapIter) Next() bool
pkg reflect, method (*MapIter) Value() Value
pkg reflect, method (Value) MapRange() *MapIter
pkg reflect, type MapIter struct
pkg runtime/debug, func ReadBuildInfo() (*BuildInfo, bool)
pkg runtime/debug, type BuildInfo struct

pkg reflect, method (*MapIter) Reset(Value)
pkg reflect, method (Value) CanComplex() bool
pkg reflect, method (Value) CanFloat() bool
pkg reflect, method (Value) CanInt() bool
pkg reflect, method (Value) CanUint() bool
pkg reflect, method (Value) FieldByIndexErr([]int) (Value, error)
pkg reflect, method (Value) SetIterKey(*MapIter)
pkg reflect, method (Value) SetIterValue(*MapIter)

func mapiter1(m map[string]string) *reflect.MapIter { // ERROR "leaking param: m$"
	mv := reflect.ValueOf(m)
	return mv.MapRange()
}

func mapiter2(m map[string]string) string { // ERROR "leaking param: m$"
	mv := reflect.ValueOf(m)
	it := mv.MapRange()
	if it.Next() {
		return it.Key().String()
	}
	return ""
}