KOS_OP_JUMP_FALSE_VAR

• Style: EXTRA (VAR, LABEL, NOARG, NOARG). Row = name, target pc.

• Stack: No stack effect. Read the value the name resolves to in the current frame’s namespace; if false, jump to the target, else advance. Raises NameError when the name is unbound.

• Invariants: Jump locality for target.

• Compiler form: Produced by ByteCodeProcessor.fuse_feeders absorbing a bare VAR load into the JUMP_FALSE it feeds; a CONST feeder was folded in the squish. Lowers to JUMP_FALSE_FAST when the name has a fast slot.

Example: (when x ...) with x resolved by name.

index	opcode	arg	arg view	comment
0	JUMP_FALSE_VAR	0	(v#0 (‘x’), -> 3, 0, 0)	if x is false -> pc=3
1	CONST	1	1 (1)	body
2	JUMP	4	4 (-> 4)
3	CONST	2	2 (None)
4	RETURN	1	1