Set lineno and end_lineno on Arguments (#2865)

Author: jacobtylerwalls

ChangeLog

@@ -16,6 +16,8 @@ Release date: TBA
   Closes #2741
   Closes pylint-dev/pylint#6094
 
+* ``lineno`` and ``end_lineno`` are now available on ``Arguments``.
+
 * Add helper to iterate over all annotations nodes of function arguments,
   ``Arguments.get_annotations()``.
 

astroid/rebuilder.py

@@ -9,6 +9,7 @@
 from __future__ import annotations
 
 import ast
+import itertools
 import sys
 import token
 from collections.abc import Callable, Collection, Generator
@@ -589,6 +590,16 @@ def visit_arguments(
             type_comment_kwonlyargs=type_comment_kwonlyargs,
             type_comment_posonlyargs=type_comment_posonlyargs,
         )
+        if start_end_lineno_pairs := [
+            (arg.lineno, arg.end_lineno)
+            for arg in itertools.chain(
+                node.args, node.posonlyargs, node.kwonlyargs, [node.vararg, node.kwarg]
+            )
+            if arg
+        ]:
+            newnode.lineno = min(startend[0] for startend in start_end_lineno_pairs)
+            newnode.end_lineno = max(startend[1] for startend in start_end_lineno_pairs)
+
         # save argument names in locals:
         assert newnode.parent
         if vararg:

tests/test_nodes_lineno.py

@@ -589,6 +589,8 @@ async def func():  #@
         assert (f1.body[0].lineno, f1.body[0].col_offset) == (6, 4)
         assert (f1.body[0].end_lineno, f1.body[0].end_col_offset) == (6, 8)
 
+        assert (f1.args.lineno, f1.args.end_lineno) == (2, 4)
+
         # pos only arguments
         # TODO fix column offset: arg -> arg (AssignName)
         assert isinstance(f1.args.posonlyargs[0], nodes.AssignName)