Function emit_fold_wrapper 

pub fn emit_fold_wrapper(
    name: &str,
    top: &str,
    clock: &str,
    reset: Option<&Reset>,
    ports: &[DutPort],
) -> String

The synthesis wrapper qorsyn_<name>(clk, rst, sig) of a design measured without a functional contract (a memory controller, whose functional gate is a board memtest): every input of top from a register the seeded xorshift64 stimulus refills each cycle, one rotated lane word per 64 bits as the harness draws operands; every output bit folded into a registered 64-bit XOR whose low 16 bits are sig; the design kept whole as u_dut, so its cells and its register-to-register paths are what synthesis and place-and-route measure.