diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index b77d35c9..bc2083bb 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -21,6 +21,7 @@ from jedi.parser_utils import get_executable_nodes
 from jedi import debug
 from jedi import settings
 from jedi import cache
+from jedi.file_io import KnownContentFileIO
 from jedi.api import classes
 from jedi.api import interpreter
 from jedi.api import helpers
@@ -38,8 +39,7 @@ from jedi.evaluate.syntax_tree import tree_name_to_contexts
 from jedi.evaluate.context import ModuleContext
 from jedi.evaluate.base_context import ContextSet
 from jedi.evaluate.context.iterable import unpack_tuple_to_dict
-from jedi.evaluate.gradual.conversion import try_stubs_to_actual_context_set, \
-    try_stub_to_actual_names
+from jedi.evaluate.gradual.conversion import try_stub_to_actual_names
 from jedi.evaluate.gradual.utils import load_proper_stub_module
 
 # Jedi uses lots and lots of recursion. By setting this a little bit higher, we
@@ -164,11 +164,12 @@ class Script(object):
                 names = import_names
                 is_package = is_p
 
+        file_io = KnownContentFileIO(cast_path(self.path), self._code)
         if self.path is not None and self.path.endswith('.pyi'):
             # We are in a stub file. Try to load the stub properly.
             stub_module = load_proper_stub_module(
                 self._evaluator,
-                cast_path(self.path),
+                file_io,
                 names,
                 self._module_node
             )
@@ -179,14 +180,11 @@ class Script(object):
             names = ('__main__',)
 
         module = ModuleContext(
-            self._evaluator, self._module_node, cast_path(self.path),
+            self._evaluator, self._module_node, file_io,
             string_names=names,
             code_lines=self._code_lines,
             is_package=is_package,
         )
-        #module, = try_to_merge_with_stub(
-        #    self._evaluator, None, module.string_names, ContextSet([module])
-        #)
         if names[0] not in ('builtins', '__builtin__', 'typing'):
             # These modules are essential for Jedi, so don't overwrite them.
             self._evaluator.module_cache.add(names, ContextSet([module]))
@@ -469,7 +467,7 @@ class Interpreter(Script):
             self._evaluator,
             self._module_node,
             self.namespaces,
-            path=self.path,
+            file_io=KnownContentFileIO(self.path, self._code),
             code_lines=self._code_lines,
         )
 
diff --git a/jedi/api/interpreter.py b/jedi/api/interpreter.py
index 56bb3586..d7eb50ce 100644
--- a/jedi/api/interpreter.py
+++ b/jedi/api/interpreter.py
@@ -24,14 +24,14 @@ class MixedModuleContext(Context):
     # TODO use ContextWrapper!
     type = 'mixed_module'
 
-    def __init__(self, evaluator, tree_module, namespaces, path, code_lines):
+    def __init__(self, evaluator, tree_module, namespaces, file_io, code_lines):
         self.evaluator = evaluator
         self._namespaces = namespaces
 
         self._namespace_objects = [NamespaceObject(n) for n in namespaces]
         self._module_context = ModuleContext(
             evaluator, tree_module,
-            path=path,
+            file_io=file_io,
             string_names=('__main__',),
             code_lines=code_lines
         )
diff --git a/jedi/evaluate/compiled/mixed.py b/jedi/evaluate/compiled/mixed.py
index 3a2aea7e..d9041122 100644
--- a/jedi/evaluate/compiled/mixed.py
+++ b/jedi/evaluate/compiled/mixed.py
@@ -11,6 +11,7 @@ from jedi import settings
 from jedi.evaluate import compiled
 from jedi.cache import underscore_memoization
 from jedi.evaluate import imports
+from jedi.file_io import FileIO
 from jedi.evaluate.base_context import Context, ContextSet
 from jedi.evaluate.context import ModuleContext
 from jedi.evaluate.cache import evaluator_function_cache
@@ -140,6 +141,7 @@ def _find_syntax_node_name(evaluator, access_handle):
         # The path might not exist or be e.g. <stdin>.
         return None
 
+    file_io = FileIO(path)
     module_node = _load_module(evaluator, path)
 
     if inspect.ismodule(python_object):
@@ -147,7 +149,7 @@ def _find_syntax_node_name(evaluator, access_handle):
         # a way to write a module in a module in Python (and also __name__ can
         # be something like ``email.utils``).
         code_lines = get_cached_code_lines(evaluator.grammar, path)
-        return module_node, module_node, path, code_lines
+        return module_node, module_node, file_io, code_lines
 
     try:
         name_str = python_object.__name__
@@ -186,7 +188,7 @@ def _find_syntax_node_name(evaluator, access_handle):
     # completions at some points but will lead to mostly correct type
     # inference, because people tend to define a public name in a module only
     # once.
-    return module_node, names[-1].parent, path, code_lines
+    return module_node, names[-1].parent, file_io, code_lines
 
 
 @compiled_objects_cache('mixed_cache')
@@ -198,7 +200,7 @@ def _create(evaluator, access_handle, parent_context, *args):
     if result is None:
         return compiled_object
 
-    module_node, tree_node, path, code_lines = result
+    module_node, tree_node, file_io, code_lines = result
 
     if parent_context.tree_node.get_root_node() == module_node:
         module_context = parent_context.get_root_context()
@@ -208,7 +210,7 @@ def _create(evaluator, access_handle, parent_context, *args):
         string_names = tuple(name.split('.'))
         module_context = ModuleContext(
             evaluator, module_node,
-            path=path,
+            file_io=file_io,
             string_names=string_names,
             code_lines=code_lines,
             is_package=hasattr(compiled_object, 'py__path__'),
diff --git a/jedi/evaluate/context/module.py b/jedi/evaluate/context/module.py
index 051e2ccc..197c8efa 100644
--- a/jedi/evaluate/context/module.py
+++ b/jedi/evaluate/context/module.py
@@ -173,13 +173,17 @@ class ModuleContext(ModuleMixin, TreeContext):
     api_type = u'module'
     parent_context = None
 
-    def __init__(self, evaluator, module_node, path, string_names, code_lines, is_package=False):
+    def __init__(self, evaluator, module_node, file_io, string_names, code_lines, is_package=False):
         super(ModuleContext, self).__init__(
             evaluator,
             parent_context=None,
             tree_node=module_node
         )
-        self._path = path
+        self._file_io = file_io
+        if self._file_io is None:
+            self._path = None
+        else:
+            self._path = file_io.path
         self.string_names = string_names
         self.code_lines = code_lines
         self.is_package = is_package
diff --git a/jedi/evaluate/gradual/typeshed.py b/jedi/evaluate/gradual/typeshed.py
index ee3a3079..4019e149 100644
--- a/jedi/evaluate/gradual/typeshed.py
+++ b/jedi/evaluate/gradual/typeshed.py
@@ -4,7 +4,6 @@ import re
 from jedi.file_io import FileIO
 from jedi._compatibility import FileNotFoundError, cast_path
 from jedi.parser_utils import get_cached_code_lines
-from jedi.evaluate.cache import evaluator_function_cache
 from jedi.evaluate.base_context import ContextSet
 from jedi.evaluate.gradual.stub_context import TypingModuleWrapper, StubModuleContext
 
@@ -62,11 +61,6 @@ def _get_typeshed_directories(version_info):
             yield os.path.join(base, check_version)
 
 
-@evaluator_function_cache()
-def _load_stub(evaluator, path):
-    return evaluator.parse(file_io=FileIO(path), cache=True, use_latest_grammar=True)
-
-
 _version_cache = {}
 
 
@@ -149,7 +143,12 @@ def _try_to_load_stub(evaluator, import_names, actual_context_set,
         # foo-stubs
         for p in sys_path:
             init = os.path.join(p, *import_names) + '-stubs' + os.path.sep + '__init__.pyi'
-            m = _try_to_load_stub_from_file(evaluator, actual_context_set, init, import_names)
+            m = _try_to_load_stub_from_file(
+                evaluator,
+                actual_context_set,
+                file_io=FileIO(init),
+                import_names=import_names,
+            )
             if m is not None:
                 return m
 
@@ -172,8 +171,8 @@ def _try_to_load_stub(evaluator, import_names, actual_context_set,
                     evaluator,
                     actual_context_set,
                     # The file path should end with .pyi
-                    file_path,
-                    import_names
+                    file_io=FileIO(file_path),
+                    import_names=import_names,
                 )
                 if m is not None:
                     return m
@@ -202,8 +201,8 @@ def _try_to_load_stub(evaluator, import_names, actual_context_set,
             m = _try_to_load_stub_from_file(
                 evaluator,
                 actual_context_set,
-                os.path.join(p, *names_for_path) + '.pyi',
-                import_names,
+                file_io=FileIO(os.path.join(p, *names_for_path) + '.pyi'),
+                import_names=import_names,
             )
             if m is not None:
                 return m
@@ -229,35 +228,44 @@ def _load_from_typeshed(evaluator, actual_context_set, parent_module_context, im
     if map_ is not None:
         path = map_.get(import_name)
         if path is not None:
-            return _try_to_load_stub_from_file(evaluator, actual_context_set, path, import_names)
+            return _try_to_load_stub_from_file(
+                evaluator,
+                actual_context_set,
+                file_io=FileIO(path),
+                import_names=import_names,
+            )
 
 
-def _try_to_load_stub_from_file(evaluator, actual_context_set, path, import_names):
+def _try_to_load_stub_from_file(evaluator, actual_context_set, file_io, import_names):
     try:
-        stub_module_node = _load_stub(evaluator, path)
+        stub_module_node = evaluator.parse(
+            file_io=file_io,
+            cache=True,
+            use_latest_grammar=True
+        )
     except (OSError, IOError):  # IOError is Python 2 only
         # The file that you're looking for doesn't exist (anymore).
         return None
     else:
         return create_stub_module(
-            evaluator, actual_context_set, stub_module_node, path,
+            evaluator, actual_context_set, stub_module_node, file_io,
             import_names
         )
 
 
-def create_stub_module(evaluator, actual_context_set, stub_module_node, path, import_names):
+def create_stub_module(evaluator, actual_context_set, stub_module_node, file_io, import_names):
     if import_names == ('typing',):
         module_cls = TypingModuleWrapper
     else:
         module_cls = StubModuleContext
-    file_name = os.path.basename(path)
+    file_name = os.path.basename(file_io.path)
     stub_module_context = module_cls(
         actual_context_set, evaluator, stub_module_node,
-        path=path,
+        file_io=file_io,
         string_names=import_names,
         # The code was loaded with latest_grammar, so use
         # that.
-        code_lines=get_cached_code_lines(evaluator.latest_grammar, path),
+        code_lines=get_cached_code_lines(evaluator.latest_grammar, file_io.path),
         is_package=file_name == '__init__.pyi',
     )
     return stub_module_context
diff --git a/jedi/evaluate/gradual/utils.py b/jedi/evaluate/gradual/utils.py
index 7de63252..6bc60e69 100644
--- a/jedi/evaluate/gradual/utils.py
+++ b/jedi/evaluate/gradual/utils.py
@@ -3,11 +3,12 @@ import os
 from jedi.evaluate.gradual.typeshed import TYPESHED_PATH, create_stub_module
 
 
-def load_proper_stub_module(evaluator, path, import_names, module_node):
+def load_proper_stub_module(evaluator, file_io, import_names, module_node):
     """
     This function is given a random .pyi file and should return the proper
     module.
     """
+    path = file_io.path
     assert path.endswith('.pyi')
     if path.startswith(TYPESHED_PATH):
         # /foo/stdlib/3/os/__init__.pyi -> stdlib/3/os/__init__
@@ -24,7 +25,7 @@ def load_proper_stub_module(evaluator, path, import_names, module_node):
             return None
 
         stub = create_stub_module(
-            evaluator, actual_context_set, module_node, path, import_names
+            evaluator, actual_context_set, module_node, file_io, import_names
         )
         evaluator.stub_module_cache[import_names] = stub
         return stub
diff --git a/jedi/evaluate/imports.py b/jedi/evaluate/imports.py
index 4c6b9f13..5fec9415 100644
--- a/jedi/evaluate/imports.py
+++ b/jedi/evaluate/imports.py
@@ -464,7 +464,7 @@ def _load_python_module(evaluator, file_io, sys_path=None,
     from jedi.evaluate.context import ModuleContext
     return ModuleContext(
         evaluator, module_node,
-        path=file_io.path,
+        file_io=file_io,
         string_names=import_names,
         code_lines=get_cached_code_lines(evaluator.grammar, file_io.path),
         is_package=is_package,
diff --git a/jedi/evaluate/sys_path.py b/jedi/evaluate/sys_path.py
index 4cbef176..8dea434b 100644
--- a/jedi/evaluate/sys_path.py
+++ b/jedi/evaluate/sys_path.py
@@ -6,6 +6,7 @@ from jedi.evaluate.base_context import ContextualizedNode
 from jedi.evaluate.helpers import is_string
 from jedi.common.utils import traverse_parents
 from jedi.parser_utils import get_cached_code_lines
+from jedi.file_io import FileIO
 from jedi import settings
 from jedi import debug
 
@@ -140,9 +141,10 @@ def discover_buildout_paths(evaluator, script_path):
 
 
 def _get_paths_from_buildout_script(evaluator, buildout_script_path):
+    file_io = FileIO(buildout_script_path)
     try:
         module_node = evaluator.parse(
-            path=buildout_script_path,
+            file_io=file_io,
             cache=True,
             cache_path=settings.cache_directory
         )
@@ -152,7 +154,7 @@ def _get_paths_from_buildout_script(evaluator, buildout_script_path):
 
     from jedi.evaluate.context import ModuleContext
     module = ModuleContext(
-        evaluator, module_node, buildout_script_path,
+        evaluator, module_node, file_io,
         string_names=None,
         code_lines=get_cached_code_lines(evaluator.grammar, buildout_script_path),
     )
diff --git a/jedi/plugins/stdlib.py b/jedi/plugins/stdlib.py
index 6612733c..03674b81 100644
--- a/jedi/plugins/stdlib.py
+++ b/jedi/plugins/stdlib.py
@@ -437,7 +437,7 @@ def collections_namedtuple(obj, arguments):
     generated_class = next(module.iter_classdefs())
     parent_context = ModuleContext(
         evaluator, module,
-        path=None,
+        file_io=None,
         string_names=None,
         code_lines=parso.split_lines(code, keepends=True),
     )