def jpeg.scan.prepend
import gralha-jpeg-decode@0.1.0.1/jpeg.bend as Jpegimport Base
432def jpeg.scan.prepend(scan: JPEGScan, component: JPEGComponent) -> JPEGScan:
433 JPEGScan{components, stream} = scan
434 JPEGScan{Con{component, components}, stream}