Index: src/AST/Pass.hpp
===================================================================
--- src/AST/Pass.hpp	(revision a065f1ffe843ea0a3ceecdf36a1210abe07a2441)
+++ src/AST/Pass.hpp	(revision e9e9f561e08b390229ff9a102aa25333c265fb49)
@@ -328,4 +328,5 @@
 struct PureVisitor {};
 
+/// Keep track of the nearest parent node's location field.
 struct WithCodeLocation {
 	const CodeLocation * location = nullptr;