func strings.TrimFunc

4 uses

	strings (current package)
		strings.go#L906: func TrimFunc(s string, f func(rune) bool) string {
		strings.go#L1097: 			return TrimFunc(s[start:], unicode.IsSpace)

	github.com/google/go-cmp/cmp
		report_reflect.go#L333: 		isTripleQuoted = !strings.HasPrefix(strings.TrimPrefix(line, prefix), `"""`) && !strings.HasPrefix(line, "...") && strings.TrimFunc(line, isPrintable) == "" && len(line) <= maxLen
		report_slices.go#L209: 				isTripleQuoted = !strings.HasPrefix(line, `"""`) && !strings.HasPrefix(line, "...") && strings.TrimFunc(line, isPrintable) == ""

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)