Migen Current vs New Compare

led2.py

new=True

if new:
    from migen import *
    from migen.build.platforms import mercury
    bn="led2_new"
else:
    from migen.fhdl.std import *
    from mibuild.platforms import mercury
    bn="led2"
plat = mercury.Platform()
plat.add_extension(mercury.leds)
led = plat.request("user_led")
m = Module()
counter = Signal(26)
m.comb += led.eq(counter[25])
m.sync += counter.eq(counter + 1)
plat.build_cmdline(m, source=True, run=False, build_dir="led2", build_name=bn)