PR for llvm#79568 (llvm#80120)

Backporting llvm#79568 to clang 18.

Author: zyn0217

clang/docs/ReleaseNotes.rst

@@ -382,6 +382,11 @@ Bug Fixes to C++ Support
 - Fix a crash when using ``source_location`` in the trailing return type of a lambda expression. (#GH67134)
 - A follow-up fix was added for (#GH61460), as the previous fix was not entirely correct. (#GH86361)
 
+
+- Fixed a bug where variables referenced by requires-clauses inside
+  nested generic lambdas were not properly injected into the constraint scope.
+  (`#73418 <https://github.com/llvm/llvm-project/issues/73418>`_)
+
 - Fix incorrect code generation caused by the object argument of ``static operator()`` and ``static operator[]`` calls not being evaluated.
   Fixes (`#67976 <https://github.com/llvm/llvm-project/issues/67976>`_)