Add a new EvaluatedObject container

This container is used to store values that have already been evaluated.
For instance, 79d5a3a783cf0b5a729e4e467508e955a0cca55f added support
for inferring `tuple()` call arguments, but as a result, the `elts` of a `Tuple`
can be objects not *references*. As a result, `Tuple.elts` can contain class objects
rather than references (names) to class object. The `EvaluatedObject` helps with that,
as we still have to call `.infer()` (albeit a no-op) to grab the inferred value of an element.

1 files changed, 34 insertions, 0 deletions

diff --git a/astroid/node_classes.py b/astroid/node_classes.py
index 2e03f4ea..f16b61bd 100644
--- a/astroid/node_classes.py
+++ b/astroid/node_classes.py
@@ -4726,6 +4726,40 @@ class Unknown(mixins.AssignTypeMixin, NodeNG):
         yield util.Uninferable
 
 
+class EvaluatedObject(NodeNG):
+    """Contains an object that has already been inferred
+
+    This class is useful to pre-evaluate a particular node,
+    with the resulting class acting as the non-evaluated node.
+    """
+
+    name = "EvaluatedObject"
+    _astroid_fields = ("original",)
+    _other_fields = ("value",)
+
+    original = None
+    """The original node that has already been evaluated
+
+    :type: NodeNG
+    """
+
+    value = None
+    """The inferred value
+
+    :type: Union[Uninferable, NodeNG]
+    """
+
+    def __init__(self, original, value):
+        self.original = original
+        self.value = value
+        self.lineno = self.original.lineno
+        self.parent = self.original.parent
+        self.col_offset = self.original.col_offset
+
+    def infer(self, context=None, **kwargs):
+        yield self.value
+
+
 # constants ##############################################################
 
 CONST_CLS = {