1 files changed, 1 insertions, 4 deletions
diff --git a/format.py b/format.py
index dd27633..e6f7eae 100644
--- a/format.py
+++ b/format.py
@@ -23,7 +23,6 @@ from .plugin_registry import MetaPlugin, PluginRegistry
 from .protocol import Protocol
 from .utils import arg2wrapped, args2sgpl, args2tuple, args2unwrapped, \
                    classproperty, \
-                   filterdict_keep, \
                    head_tail, \
                    iterattrs, \
                    immutable, \
@@ -369,11 +368,9 @@ class SimpleFormat(Format, MetaPlugin):
         """
         # turning @DIGIT+ magic files into fileobjs (needs global view)
         if tuplist(io_decl) and len(io_decl) >= 2 and io_decl[0] == cls.FILE:
-            interpols = [x.split('.', 1)[0] for x in io_decl[1].split('{')[1:]]
             try:
                 io_decl = args2tuple(io_decl[0],
-                                     io_decl[1].format(**filterdict_keep(
-                                         interpolations, *interpols)),
+                                     io_decl[1].format(**interpolations),
                                      *io_decl[2:])
             except (ValueError, KeyError):
                 pass