Bugs found in test_complex.py

list comprehensions from 3.x closures didn't handle nested for's
before 3.6.

Handle nanj and infj.

test/simple_source/bug31/10_complex.py

@@ -0,0 +1,41 @@
+# Greatly simplified from from 3.3 test_complex.py
+
+# RUNNABLE!
+def assertCloseAbs(x, y, eps=1e-09):
+    """Return true iff floats x and y "are close\""""
+    if abs(x) > abs(y):
+        x, y = y, x
+    if y == 0:
+        return abs(x) < eps
+    if x == 0:
+        return abs(y) < eps
+    assert abs((x - y) / y) < eps
+
+def assertClose(x, y, eps=1e-09):
+    """Return true iff complexes x and y "are close\""""
+    assertCloseAbs(x.real, y.real, eps)
+    assertCloseAbs(x.imag, y.imag, eps)
+
+def check_div(x, y):
+    """Compute complex z=x*y, and check that z/x==y and z/y==x."""
+    z = x * y
+    if x != 0:
+        q = z / x
+        assertClose(q, y)
+        q = z.__truediv__(x)
+        assertClose(q, y)
+    if y != 0:
+        q = z / y
+        assertClose(q, x)
+        q = z.__truediv__(y)
+        assertClose(q, x)
+
+def test_truediv():
+    simple_real = [float(i) for i in range(-5, 6)]
+    simple_complex = [complex(x, y) for x in simple_real for y in simple_real]
+    for x in simple_complex:
+        for y in simple_complex:
+            check_div(x, y)
+
+z2 = -1e1000j # Check that we can handle -inf as a complex number
+test_truediv()