importing of C++ nested generics like std::vector<T>::iterator, using the apostrophe operator

doc/nimc.txt

@@ -596,6 +596,25 @@ Produces:
   x[6] = 91.4;
 
 
+- If more precise control is needed, the apostrophe ``'`` can be used in the
+  supplied pattern to denote the concrete type parameters of the generic type.
+  See the usage of the apostrophe operator in proc patterns for more details.
+
+.. code-block:: nim
+
+  type
+    VectorIterator {.importcpp: "std::vector<'0>::iterator".} [T] = object
+
+  var x: VectorIterator[cint]
+
+
+Produces:
+
+.. code-block:: C
+  
+  std::vector<int>::iterator x;
+
+
 ImportObjC pragma
 -----------------
 Similar to the `importc pragma for C <manual.html#importc-pragma>`_, the