feat: expose end_col_offset in mypy ast nodes

Author: devmessias

mypy/fastparse.py

@@ -373,6 +373,8 @@ def set_line(self, node: N, n: AstNode) -> N:
         node.line = n.lineno
         node.column = n.col_offset
         node.end_line = getattr(n, "end_lineno", None) if isinstance(n, ast3.expr) else None
+        node.end_column = getattr(n, "end_col_offset", None) if isinstance(n, ast3.expr) else None
+
         return node
 
     def translate_opt_expr_list(self, l: Sequence[Optional[AST]]) -> List[Optional[Expression]]:

mypy/nodes.py

@@ -23,12 +23,13 @@
 
 class Context:
     """Base type for objects that are valid as error message locations."""
-    __slots__ = ('line', 'column', 'end_line')
+    __slots__ = ('line', 'column', 'end_line', "end_column")
 
     def __init__(self, line: int = -1, column: int = -1) -> None:
         self.line = line
         self.column = column
         self.end_line: Optional[int] = None
+        self.end_column: Optional[int] = None
 
     def set_line(self,
                  target: Union['Context', int],