';'-separated class attributes lose all but the first

class P:
    k = 1; j = 2
print(P.j)        # CPython: 2    Nil Python: class method not found: j

Cause and fix

The three statement loops (the program loop, PyParseBlock, and the module loop) all consume ;. A class body is different, because PyRegisterClassMembers reads it at the token level first. Every attribute, alias and annotation branch there requires the name to open a line, and every one then skips to the next NEWLINE. Fixing only the class parser would have left the pre-pass disagreeing with it.

So the shape is normalised in the lexer, the way the one-line def/class suite already is. PyClassBodySemicolons runs after each lex and applies to lines that are:

• inside a class body, at the body's own indentation;
• opened by a name or a string (and not by with, async or match).

On those lines, a ; outside brackets becomes a NEWLINE token. A one-line def f(self): a; b is untouched, because the lexer has already made it an indented suite one level deeper, where the ; belongs to the def.

Measured (2026-09-29, fixedpoint 8edde2f6b68a)

• test/test_nilpy_semicolons_in_a_class_body.npy covers:

  • plain, string, list and annotated attributes, and a trailing ;;
  • a method alias after a ;;
  • a one-line class;
  • a one-line def, and ; in a method body;
  • a subclass that overrides one attribute.

  It equals CPython on x86-64, i386, riscv32 and wasm32. The previous compiler refuses it on all four. The rows are x86-64, i386 and wasm32.

• Scope: none of the 1714 tracked .py/.npy files has a class-body ; outside a docstring (a docstring is one string token, so this pass never sees its text). No existing program's tokens change.