the example always fails if the string contains a trailing space before a newline

[David M]

Not quite sure if this is a bug but it's annoying:

If the example tested string contains a trailing space before a newline, the test always fails no matter how.

// this test passes 

func ExampleFormat() {

    fmt.Println("a\nb")

    // Output:

    // a 

    // b 

}

// this test fails no matter we put "a" or "a " in the first output line. 

func ExampleFormat() { 

    fmt.Println("a \nb") 

    // Output:

    // a

    // b

 }

The doc says "The comparison ignores leading and trailing space." I guess what's going on here is that it cut the trailing space in the desired output, but doesn't handle the space in the practical output if it's before a newline. Because the practical output may come from a 3rd party library, we have to respect how they print things.

[Sean Liao]

https://go.dev/issue/26460

- sean

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