Large literal int + double test.

tests/run/literals.pyx

@@ -62,3 +62,10 @@ def test_complex(x):
     True
     """
     return x == 0.3333333333333333j
+
+def test_large_int(double x):
+    """
+    >>> test_large_int(0)
+    1e+100
+    """
+    return x + 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000