Param defaults were not correctly followed when goto was used on them.

jedi/evaluate/__init__.py

@@ -468,7 +468,7 @@ class Evaluator(object):
         return helpers.evaluate_call_of_leaf(context, name)
 
     def goto(self, context, name):
-        definition = name._get_definition(import_name_always=True)
+        definition = name._get_definition(import_name_always=True) or name
 
         par = name.parent
         typ = par.type
@@ -501,9 +501,9 @@ class Evaluator(object):
             # Only take the parent, because if it's more complicated than just
             # a name it's something you can "goto" again.
             return [TreeNameDefinition(context, name)]
-        elif typ == 'param' and par.name:
+        elif definition.type == 'param':
             return [ParamName(context, name)]
-        elif typ in ('param', 'funcdef', 'classdef') and par.name is name:
+        elif typ in ('funcdef', 'classdef') and par.name is name:
             return [TreeNameDefinition(context, name)]
         elif isinstance(definition, tree.Import):
             module_names = imports.infer_import(context, name, is_goto=True)

test/completion/goto.py

@@ -184,7 +184,7 @@ param = ClassDef
 def ab1(param): pass
 #! 9 ['param param']
 def ab2(param): pass
-#! 11 ['param a=param']
+#! 11 ['param = ClassDef']
 def ab3(a=param): pass
 
 ab1(ClassDef);ab2(ClassDef);ab3(ClassDef)