Index: src/AST/Pass.hpp
===================================================================
--- src/AST/Pass.hpp	(revision 4520b77e192c372763501afd950a0f1452141b3b)
+++ src/AST/Pass.hpp	(revision 9cd5bd2665deba4718673a3686869490de73341e)
@@ -328,4 +328,5 @@
 struct PureVisitor {};
 
+/// Keep track of the nearest parent node's location field.
 struct WithCodeLocation {
 	const CodeLocation * location = nullptr;