[Community puzzle] PL/0 Compiler & Processor ( Part I )

Hello coding gamers !

I need your help to approve the puzzle ( PL/0 Compiler & Processor ( Part I ) : Coding Games and Programming Challenges to Code Better ) which is the first part of a series of puzzles:
Part I: a PL/0 compiler
Part II: a PL/0 processor

PL/0 is a simple but complete programming language used to teach all main features of a compiler and processor. Fan of compilers and pseudo code will enjoy those puzzles

Many thanks for your support.