}{
		{name: "empty", value: "", want: nil},
		{name: "space", value: " ", want: nil},
		{name: "one", value: "a", want: []string{"a"}},
		{name: "leading_space", value: " a", want: []string{"a"}},
		{name: "trailing_space", value: "a ", want: []string{"a"}},
		{name: "two", value: "a b", want: []string{"a", "b"}},
		{name: "two_multi_space", value: "a  b", want: []string{"a", "b"}},
		{name: "two_tab", value: "a\tb", want: []string{"a", "b"}},

		// Other spaces in the format match input of one or more spaces or end-of-input.
		if isSpace(fmtc) {
			newlines := 0
			trailingSpace := false
			for isSpace(fmtc) && i < len(format) {
				if fmtc == '\n' {
					newlines++
					trailingSpace = false
				} else {
					trailingSpace = true
				}
				i += w
				fmtc, w = utf8.DecodeRuneInString(format[i:])
			}
			for j := 0; j < newlines; j++ {