[pyflakes] Avoid false positives in @no_type_check contexts (F821, F722) (#14615)

crates/ruff_linter/resources/test/fixtures/pyflakes/F722_1.py

@@ -0,0 +1,21 @@
+"""Regression test for #13824.
+
+Don't report an error when the function being annotated has the
+`@no_type_check` decorator.
+
+However, we still want to ignore this annotation on classes. See
+https://github.com/python/typing/pull/1615/files and the discussion on #14615.
+"""
+
+from typing import no_type_check
+
+
+@no_type_check
+def f(arg: "this isn't python") -> "this isn't python either":
+    x: "this also isn't python" = 0
+
+
+@no_type_check
+class C:
+    def f(arg: "this isn't python") -> "this isn't python either":
+        x: "this also isn't python" = 1

crates/ruff_linter/resources/test/fixtures/pyflakes/F821_30.py

@@ -0,0 +1,21 @@
+"""Regression test for #13824.
+
+Don't report an error when the function being annotated has the
+`@no_type_check` decorator.
+
+However, we still want to ignore this annotation on classes. See
+https://github.com/python/typing/pull/1615/files and the discussion on #14615.
+"""
+
+import typing
+
+
+@typing.no_type_check
+def f(arg: "A") -> "R":
+    x: "A" = 1
+
+
+@typing.no_type_check
+class C:
+    def f(self, arg: "B") -> "S":
+        x: "B" = 1