Fix param position lookups. Also forward annotations have the correct resolution path now (starting at the end of the file).

test/completion/functions.py

@@ -178,6 +178,23 @@ nested_default(a=1.0)[1]
 #? str()
 nested_default(a=1.0, b='')[1]
 
+# Defaults should only work if they are defined before - not after.
+def default_function(a=default):
+    #?
+    return a
+
+#?
+default_function()
+
+default = int()
+
+def default_function(a=default):
+    #? int()
+    return a
+
+#? int()
+default_function()
+
 
 # -----------------
 # closures

test/completion/pep0484.py

@@ -137,9 +137,7 @@ function_with_non_pep_0484_annotation(1, 2, 3, "force string")
 def function_forward_reference_dynamic(
         x: return_str_type(),
         y: "return_str_type()") -> None:
-    # technically should not be resolvable since out of scope,
-    # but jedi is not smart enough for that
-    #? str()
+    #?
     x
     #? str()
     y