From aaf9192673614315781dca24a862b719354c0b54 Mon Sep 17 00:00:00 2001
From: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Date: Wed, 6 Aug 2025 23:41:00 +0200
Subject: [PATCH] Fix false-negative for used-before-assignment with postponed
 evaluation in function defs

---
 doc/whatsnew/fragments/10482.false_negative |  3 +++
 pylint/checkers/variables.py                | 12 +++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 doc/whatsnew/fragments/10482.false_negative

diff --git a/doc/whatsnew/fragments/10482.false_negative b/doc/whatsnew/fragments/10482.false_negative
new file mode 100644
index 0000000000..f689436b8b
--- /dev/null
+++ b/doc/whatsnew/fragments/10482.false_negative
@@ -0,0 +1,3 @@
+Fix false-negative for ``used-before-assignment`` with ``from __future__ import annotations`` in function definitions.
+
+Refs #10482
diff --git a/pylint/checkers/variables.py b/pylint/checkers/variables.py
index 5ada60a2bc..e7cb769c23 100644
--- a/pylint/checkers/variables.py
+++ b/pylint/checkers/variables.py
@@ -1929,7 +1929,17 @@ def _check_consumer(
                 # and unevaluated annotations inside a function body
                 if not (
                     self._postponed_evaluation_enabled
-                    and isinstance(stmt, (nodes.AnnAssign, nodes.FunctionDef))
+                    and (
+                        isinstance(stmt, nodes.AnnAssign)
+                        or (
+                            isinstance(stmt, nodes.FunctionDef)
+                            and node
+                            not in {
+                                *(stmt.args.defaults or ()),
+                                *(stmt.args.kw_defaults or ()),
+                            }
+                        )
+                    )
                 ) and not (
                     isinstance(stmt, nodes.AnnAssign)
                     and utils.get_node_first_ancestor_of_type(stmt, nodes.FunctionDef)