An example of conversion problems when a signal is used in more than one conversion.

problem_with_multiple_converts.py

from myhdl import *

@block
def block1(clock, input_signal, output_signal):

    @always(clock.posedge)
    def driver():
        output_signal.next = input_signal

    return driver

@block
def block2(clock, input_signal, output_signal):

    @always(clock.posedge)
    def driver():
        output_signal.next = input_signal

    return driver


clock = Signal(False)
output_signal = Signal(False)
input_signal = Signal(False)

inst1 = block1(clock, input_signal, output_signal)
inst2 = block2(clock, input_signal, output_signal)

inst1.convert()
inst2.convert()