This is a marvelous article. I first encountered a many-many pass compiler when working on the IBM 1800 (same architecture as the IBM 1130) where the Fortran I

This is a marvelous article. I first encountered a many-many pass compiler when working on the IBM 1800 (same architecture as the IBM 1130) where the Fortran II compiler had 29 passes. It was challenging, as the machines often had only 4k and the removable cartridge disks were 5 megs.