题目：
Implement a
Readertype that emits an infinite stream of the ASCII character'A'.
实现一个Reader类型，只含有'A'的流。
代码：
package main
import "golang.org/x/tour/reader"
type MyReader struct{}
// TODO: Add a Read([]byte) (int, error) method to MyReader.
func (r MyReader) Read(b []byte) (n int, err error) {
for i := range b {
b[i] = 'A'
}
return len(b), nil
}
func main() {
reader.Validate(MyReader{})
}
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本文标题：Exercise: Readers
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