if field.DataType == Time {
			field.AutoCreateTime = UnixTime
		} else if strings.ToUpper(v) == "NANO" {
			field.AutoCreateTime = UnixNanosecond
		} else if strings.ToUpper(v) == "MILLI" {
			field.AutoCreateTime = UnixMillisecond
		} else {
			field.AutoCreateTime = UnixSecond
		}
	}

	f.walk(ast2, ctxProg, (*File).saveExprs)

	// Accumulate exported functions.
	// The comments are only on ast1 but we need to
	// save the function bodies from ast2.
	// The first walk fills in ExpFunc, and the
	// second walk changes the entries to
	// refer to ast2 instead.
	f.walk(ast1, ctxProg, (*File).saveExport)
	f.walk(ast2, ctxProg, (*File).saveExport2)

	f.Comments = ast1.Comments

	b, err := io.ReadAll(r)
	w.buf = append(w.buf, b...)
	w.readFromBytes += len(b)
	return int64(len(b)), err
}

// Test that calling (*Writer).ReadFrom with a partially-filled buffer
// fills the buffer before switching over to ReadFrom.
func TestWriterReadFromWithBufferedData(t *testing.T) {
	const bufsize = 16

	input := createTestInput(64)
	rfw := &readFromWriter{}