From 8187c828f7d0ee44cba3e22d24ac48f2c882560c Mon Sep 17 00:00:00 2001
From: A5rocks <git@helvetica.moe>
Date: Sat, 22 Aug 2026 00:36:07 -0400
Subject: [PATCH 1/2] Don't error unnecessarily about new syntax

---
 mypy/fastparse.py                       |  8 +++++---
 mypy/test/data.py                       | 10 ++++++++--
 test-data/unit/check-inline-config.test |  7 +++++++
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/mypy/fastparse.py b/mypy/fastparse.py
index d9e2d5df8f4c1..b3e54d0da7943 100644
--- a/mypy/fastparse.py
+++ b/mypy/fastparse.py
@@ -206,13 +206,15 @@ def parse(
         options = Options()
     errors.set_file(fnam, module, options=options)
     is_stub_file = fnam.endswith(".pyi")
-    if is_stub_file:
+    if ignore_errors:
+        feature_version = sys.version_info[1]
+    elif is_stub_file:
         feature_version = defaults.PYTHON3_VERSION[1]
-        if options.python_version[0] == 3 and options.python_version[1] > feature_version:
-            feature_version = options.python_version[1]
     else:
         assert options.python_version[0] >= 3
         feature_version = options.python_version[1]
+    if options.python_version[0] == 3 and options.python_version[1] > feature_version:
+        feature_version = options.python_version[1]
     try:
         # Disable
         # - deprecation warnings for 'invalid escape sequence' (Python 3.11 and below)
diff --git a/mypy/test/data.py b/mypy/test/data.py
index 30e4ef95adc85..f406b0801db29 100644
--- a/mypy/test/data.py
+++ b/mypy/test/data.py
@@ -158,8 +158,8 @@ def _item_fail(msg: str) -> NoReturn:
             for arg in args:
                 if arg.startswith("version"):
                     compare_op = arg[7:9]
-                    if compare_op not in {">=", "=="}:
-                        _item_fail("Only >= and == version checks are currently supported")
+                    if compare_op not in {">=", "==", "< "}:
+                        _item_fail("Only `>=', `==', and `< ' version checks are currently supported")
                     version_str = arg[9:]
                     try:
                         version = tuple(int(x) for x in version_str.split("."))
@@ -181,6 +181,12 @@ def _item_fail(msg: str) -> NoReturn:
                                 f'Only minor or patch version checks are currently supported with "==": {version_str!r}'
                             )
                         version_check = sys.version_info[: len(version)] == version
+                    elif compare_op == "< ":
+                        if version < defaults.PYTHON3_VERSION:
+                            _item_fail(
+                                f"{arg} always false since minimum runtime version is {defaults.PYTHON3_VERSION}"
+                            )
+                        version_check = sys.version_info < version
             if version_check:
                 tmp_output = [expand_variables(line) for line in item.data]
                 if os.path.sep == "\\" and case.normalize_output:
diff --git a/test-data/unit/check-inline-config.test b/test-data/unit/check-inline-config.test
index 8ada54a06b48c..80949c60a291b 100644
--- a/test-data/unit/check-inline-config.test
+++ b/test-data/unit/check-inline-config.test
@@ -475,3 +475,10 @@ x = 1 # type: ignore # E: Unused "type: ignore" comment
 x = 1 # type: ignore # E: Unused "type: ignore" comment
 [out]
 main:2: error: Unrecognized option: amongus = True
+
+[case testNewSyntaxOldMypy]
+# flags: --python-version 3.10
+# mypy: ignore-errors=True
+x = t""
+[out version< 3.14]
+main:3: error: Invalid syntax

From 06c77b47829ca5e78727d173d4de1c99ffd6ac84 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sat, 22 Aug 2026 05:25:33 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 mypy/test/data.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mypy/test/data.py b/mypy/test/data.py
index f406b0801db29..989a39a0297b0 100644
--- a/mypy/test/data.py
+++ b/mypy/test/data.py
@@ -159,7 +159,9 @@ def _item_fail(msg: str) -> NoReturn:
                 if arg.startswith("version"):
                     compare_op = arg[7:9]
                     if compare_op not in {">=", "==", "< "}:
-                        _item_fail("Only `>=', `==', and `< ' version checks are currently supported")
+                        _item_fail(
+                            "Only `>=', `==', and `< ' version checks are currently supported"
+                        )
                     version_str = arg[9:]
                     try:
                         version = tuple(int(x) for x in version_str.split("."))