KOS_OP_BRACKET_CONS

• Style: COUNT. Arg = number of values on stack (bottom = first element, top = tail).

• Stack: [..., e_0, ..., e_{count-1}] → [..., result] where result is the bracket pair chain [e_0 . [e_1 . ... [e_{count-1}] ...]]. The twin of CONS over bracket pairs, built with KosBracketPair_ConsFromPtr. count 0 → push bracket-nil.

• Invariants: Each e_i may be any Python object. The tail may be any object; a bracket-nil tail makes the chain a proper bracket list.

• Use-case: Emitted by compile/bracket-cons, and by the quasiquote compiler for a [ ] form with an explicit tail, `[a . ,x].

Example: Build the bracket pair [a . 7] from a constant and a variable.

index	opcode	arg	arg view	comment
0	CONST	0	0 (sym a)	stack: […, a]
1	VAR	1	1 (x)	stack: […, a, 7]
2	BRACKET_CONS	2	2	stack: […, [a . 7]]