//  ... Delete panics if s[i:j] is not a valid slice of s. ...

//  ... Replace panics if s[i:j] is not a valid slice of s. ...

_ = s[i:j] // verify that i:j is a valid subslice

s := []string{"a", "b", "c", "d", "e"}
s = s[0:2]

_ = s[0:4] // this is a valid slice of s

slices.Delete(s, 0, 4) // panics, but s[0:4] is a valid slice of s

slices.Replace(s, 0, 4) // panics, but s[0:4] is a valid slice of s

//  ... Delete panics if j > len(s) or s[i:j] is not a valid slice of s. ...

//  ... Replace panics if j > len(s) or s[i:j] is not a valid slice of s. ...