PR for llvm/llvm-project#79568 (#80120)

Backporting llvm/llvm-project#79568 to clang 18.

Author: zyn0217

clang/docs/ReleaseNotes.rst

@@ -1126,6 +1126,11 @@ Bug Fixes to C++ Support
 - Fixed recognition of ``std::initializer_list`` when it's surrounded with ``extern "C++"`` and exported
   out of a module (which is the case e.g. in MSVC's implementation of ``std`` module). (#GH118218)
 
+
+- 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>`_)