Start splitting AST from runtime objects

There are two new directories now, runtime and tree, which are
meant to separate between runtime objects, such as Instance, BoundMethod
etc from AST nodes.

1 files changed, 12 insertions, 0 deletions

diff --git a/astroid/util.py b/astroid/util.py
index 20c44d72..7bef8809 100644
--- a/astroid/util.py
+++ b/astroid/util.py
@@ -66,3 +66,15 @@ def proxy_alias(alias_name, node_type):
                  {'__class__': object.__dict__['__class__'],
                   '__instancecheck__': _instancecheck})
     return proxy(lambda: node_type)
+
+
+def register_implementation(base):
+    """Register an implementation for the given *base*
+
+    The given base class is expected to have a `register` method,
+    similar to what `abc.ABCMeta` provides when used.
+    """
+    def wrapped(impl):
+        base.register(impl)
+        return impl
+    return wrapped