求教

初次学习golang 运行时一直包一下错误

# runtime
D:\Go\src\runtime\map.go:64:2: bucketCntBits redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:64:18
D:\Go\src\runtime\map.go:65:2: bucketCnt redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:65:23
D:\Go\src\runtime\map.go:69:2: loadFactorNum redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:69:18
D:\Go\src\runtime\map.go:70:2: loadFactorDen redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:70:18
D:\Go\src\runtime\map.go:76:2: maxKeySize redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:76:17
D:\Go\src\runtime\map.go:77:2: maxValueSize redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:77:17
D:\Go\src\runtime\map.go:82:2: dataOffset redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:85:4
D:\Go\src\runtime\map.go:91:2: empty redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:91:19
D:\Go\src\runtime\map.go:92:2: evacuatedEmpty redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:92:19
D:\Go\src\runtime\map.go:93:2: evacuatedX redeclared in this block
        previous declaration at D:\Go\src\runtime\hashmap.go:93:19
D:\Go\src\runtime\map.go:93:2: too many errors

以下是运行代码

package main

import (
    "fmt"
)

func main() {
    fmt.Println("Hello World!")
}

版本是 go version go1.11 windows/amd64