added failing test for optimised float .conjugate() method

tests/bugs.txt

@@ -19,6 +19,7 @@ class_scope_T671
 slice2_T636
 builtin_subtype_methods_T653
 dict_values_in_expression
+builtin_float
 
 # CPython regression tests that don't current work:
 pyregr.test_signal

tests/run/builtin_float.py

+
+import sys
+
+def empty_float():
+    """
+    >>> float()
+    0.0
+    >>> empty_float()
+    0.0
+    """
+    x = float()
+    return x
+
+def float_conjugate():
+    """
+    >>> float_call_conjugate()
+    1.5
+    """
+    if sys.version_info >= (2,6):
+        x = 1.5 .conjugate()
+    else:
+        x = 1.5
+    return x
+
+def float_call_conjugate():
+    """
+    >>> float_call_conjugate()
+    1.5
+    """
+    if sys.version_info >= (2,6):
+        x = float(1.5).conjugate()
+    else:
+        x = 1.5
+    return x