add test for issue 134

checks for port name collision when a function names two signals with the same name

myhdl/test/bugs/test_issue134.py

@@ -0,0 +1,29 @@
+"""
+When an interface signal gets passed into a function, it
+can get renamed to the name of the argument. When the
+function is called multiple times, this causes name collisions """
+
+from __future__ import absolute_import
+from myhdl import *
+from myhdl.conversion import verify
+
+class AB:
+    def __init__(self):
+        self.a = Signal(bool(False))
+        self.b = Signal(bool(False))
+
+def invert(sigin, sigout):
+    @always_comb
+    def foo():
+        sigout.next = not sigin
+    return foo
+
+def issue_133(ab_in, ab_out):
+    """ Instantiate an inverter for each signal """
+    inverta = invert(ab_in.a, ab_out.a)
+    invertb = invert(ab_in.b, ab_out.b)
+    return inverta, invertb
+
+def test_issue_133():
+    """ check for port name collision"""
+    assert verify(issue_133, AB(), AB()) == 0