go的变量作用域是花括号确定的，任一变量的作用域只在自身所处的花括号范围内
if, for等可以有初始化表达式的，其作用域还要高于其后的花括号一层
package main
func main() {
x:=1
println(x)
for x:=3;;{
print(x," ")
break
}
println(x)
if x:=5; true {
print(x," ")
}
println(x)
for {
x:=7
print(x," ")
break
}
println(x)
if true {
x:=9
print(x," ")
}
println(x)
if x:=2; true {
print(x," ")
x:="abc"
print(x," ")
}
println(x)
for x:=4;; {
print(x," ")
x:="def"
print(x," ")
break
}
println(x)
}
// 1
// 3 1
// 5 1
// 7 1
// 9 1
// 2 abc 1
// 4 def 1
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