1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index c23c64497a..abeb3174bd 100644
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -576,6 +576,9 @@ public:
   DiagnosticConsumer *clone(DiagnosticsEngine &Diags) const {
     // Just drop any diagnostics that come from cloned consumers; they'll
     // have different source managers anyway.
+    // FIXME: We'd like to be able to capture these somehow, even if it's just
+    // file/line/column, because they could occur when parsing module maps or
+    // building modules on-demand.
     return new IgnoringDiagConsumer();
   }
 };