docstrings for types go missing the previous way

Author: Christopher Doris

src/PythonCall.jl

@@ -17,29 +17,29 @@ include("Compat/Compat.jl")
 for m in [:Core, :Convert, :PyMacro, :Wrap, :JlWrap, :Compat]
     for k in names(@eval($m))
         if k != m
-            @eval const $k = $m.$k
+            @eval using .$m: $k
             @eval export $k
         end
     end
 end
 
 # non-exported API
 for k in [:python_executable_path, :python_library_path, :python_library_handle, :python_version]
-    @eval const $k = C.$k
+    @eval using .C: $k
 end
 for k in [:pynew, :pyisnull, :pycopy!, :getptr, :pydel!, :unsafe_pynext, :PyNULL, :CONFIG]
-    @eval const $k = Core.$k
+    @eval using .Core: $k
 end
 for k in [:pyconvert_add_rule, :pyconvert_return, :pyconvert_unconverted, :PYCONVERT_PRIORITY_WRAP, :PYCONVERT_PRIORITY_ARRAY, :PYCONVERT_PRIORITY_CANONICAL, :PYCONVERT_PRIORITY_NORMAL, :PYCONVERT_PRIORITY_FALLBACK]
-    @eval const $k = Convert.$k
+    @eval using .Convert: $k
 end
 for k in [:event_loop_on, :event_loop_off, :fix_qt_plugin_path]
-    @eval const $k = Compat.$k
+    @eval using .Compat: $k
 end
 
 # not API but used in tests
 for k in [:pyjlanytype, :pyjlarraytype, :pyjlvectortype, :pyjlbinaryiotype, :pyjltextiotype, :pyjldicttype, :pyjlmoduletype, :pyjlintegertype, :pyjlrationaltype, :pyjlrealtype, :pyjlcomplextype, :pyjlsettype, :pyjltypetype]
-    @eval const $k = JlWrap.$k
+    @eval using .JlWrap: $k
 end
 
 end