B05 pointed at the wrong milestone

lessons/b05-the-plugin/b05.ipynb

@@ -961,9 +961,11 @@
         "suite, and load code of your own into it. Everything from here on is about what the compiler\n",
         "does rather than how to get at it.\n",
         "\n",
-        "M3 is GIMPLE properly: the twenty odd statement codes, what a `GIMPLE_ASSIGN` really holds,\n",
-        "how the CFG is built and maintained, and the point in the pipeline where a function stops\n",
-        "being a tree and starts being a program."
+        "M3 is the front end, and it starts before the parser. What the thing you type `gcc` at\n",
+        "actually is and what it runs, the preprocessor, the C parser, GENERIC and the tree\n",
+        "representation everything else is built on, types, the language hooks a front end has to\n",
+        "fill in, and gimplification, which is where a function stops being a tree and starts being\n",
+        "a program."
       ]
     }
   ],

lessons/b05-the-plugin/build.py

@@ -729,9 +729,11 @@
 suite, and load code of your own into it. Everything from here on is about what the compiler
 does rather than how to get at it.
 
-M3 is GIMPLE properly: the twenty odd statement codes, what a `GIMPLE_ASSIGN` really holds,
-how the CFG is built and maintained, and the point in the pipeline where a function stops
-being a tree and starts being a program.
+M3 is the front end, and it starts before the parser. What the thing you type `gcc` at
+actually is and what it runs, the preprocessor, the C parser, GENERIC and the tree
+representation everything else is built on, types, the language hooks a front end has to
+fill in, and gimplification, which is where a function stops being a tree and starts being
+a program.
 """)
 
 raise SystemExit(lesson.save())

lessons/b05-the-plugin/grade.py

@@ -341,7 +341,7 @@ def main(argv: list[str] | None = None) -> int:
         print("You can write a plugin, say why one was refused, put a pass of your own in the")
         print("pipeline at a place you chose, switch one of GCC's off, and explain why none of")
         print("it will survive the next release without being rebuilt.")
-        print("That is M2. M3 next: GIMPLE, properly.")
+        print("That is M2. M3 next: the front end, starting before the parser.")
         return 0
     print("\nEverything except the reasoning questions is in the notebook. To reread:")
     print("    from gxray import plug, source")