diff --git a/jedi/debug.py b/jedi/debug.py
index e67cec27..692f9c82 100644
--- a/jedi/debug.py
+++ b/jedi/debug.py
@@ -86,14 +86,9 @@ def increase_indent(func):
 
 def dbg(message, *args, **kwargs):
     """ Looks at the stack, to see if a debug message should be printed. """
-    if kwargs:
-        # Python 2 compatibility, because it doesn't understand default args
-        # after *args.
-        color = kwargs.get('color')
-        if color is None:
-            raise TypeError("debug.dbg doesn't support more named arguments than color")
-    else:
-        color = 'GREEN'
+    # Python 2 compatibility, because it doesn't understand default args
+    color = kwargs.pop('color', 'GREEN')
+    assert color
 
     if debug_function and enable_notice:
         frm = inspect.stack()[1]
@@ -104,10 +99,15 @@ def dbg(message, *args, **kwargs):
             debug_function(color, i + 'dbg: ' + message % tuple(u(repr(a)) for a in args))
 
 
-def warning(message, *args):
+def warning(message, *args, **kwargs):
+    format = kwargs.pop('format', True)
+    assert not kwargs
+
     if debug_function and enable_warning:
         i = ' ' * _debug_indent
-        debug_function('RED', i + 'warning: ' + message % tuple(u(repr(a)) for a in args))
+        if format:
+            message = message % tuple(u(repr(a)) for a in args)
+        debug_function('RED', i + 'warning: ' + message)
 
 
 def speed(name):
diff --git a/jedi/evaluate/analysis.py b/jedi/evaluate/analysis.py
index 7b4b0acc..407bc7da 100644
--- a/jedi/evaluate/analysis.py
+++ b/jedi/evaluate/analysis.py
@@ -91,7 +91,7 @@ def add(evaluator, name, jedi_obj, message=None, typ=Error, payload=None):
 
     module_path = jedi_obj.get_parent_until().path
     instance = typ(name, module_path, jedi_obj.start_pos, message)
-    debug.warning(str(instance))
+    debug.warning(str(instance), format=False)
     evaluator.analysis.append(instance)
 
 
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index acbd7b08..79a1a0e2 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -181,8 +181,15 @@ class Comprehension(IterableWrapper):
         """
         comp_for = self._get_comp_for()
         # For nested comprehensions we need to search the last one.
+        from jedi.evaluate.representation import InstanceElement
+        node = self._get_comprehension().children[index]
+        if isinstance(node, InstanceElement):
+            # This seems to be a strange case that I haven't found a way to
+            # write tests against. However since it's my new goal to get rid of
+            # InstanceElement anyway, I don't care.
+            node = node.var
         last_comp = list(comp_for.get_comp_fors())[-1]
-        return helpers.deep_ast_copy(self._get_comprehension().children[index], parent=last_comp)
+        return helpers.deep_ast_copy(node, parent=last_comp)
 
     def _nested(self, comp_fors):
         evaluator = self._evaluator
@@ -453,8 +460,7 @@ def create_evaluated_sequence_set(evaluator, *types_order, **kwargs):
     ``sequence_type`` is a named argument, that doesn't work in Python2. For backwards
     compatibility reasons, we're now using kwargs.
     """
-    sequence_type = kwargs['sequence_type']
-    del kwargs['sequence_type']
+    sequence_type = kwargs.pop('sequence_type')
     assert not kwargs
 
     sets = tuple(AlreadyEvaluated(types) for types in types_order)
diff --git a/test/completion/comprehensions.py b/test/completion/comprehensions.py
index 19feb7e7..a0a709c7 100644
--- a/test/completion/comprehensions.py
+++ b/test/completion/comprehensions.py
@@ -181,3 +181,20 @@ def x():
 foo = [x for x in [1, '']][:1]
 #? int()
 foo[0]
+
+# -----------------
+# In class
+# -----------------
+
+class X():
+    def __init__(self, bar):
+        self.bar = bar
+
+    def foo(self):
+        x = [a for a in self.bar][0]
+        #? int()
+        x
+        return x
+
+#? int()
+X([1]).foo()