From 0478cfe438ca728690fb93bafe43fbe8e2b006b4 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 14 Jun 2022 14:30:31 +0200
Subject: Add note to parser::lookup_variable() description

---
 libbuild2/parser.hxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libbuild2/parser.hxx b/libbuild2/parser.hxx
index 185216b..a71d671 100644
--- a/libbuild2/parser.hxx
+++ b/libbuild2/parser.hxx
@@ -553,6 +553,10 @@ namespace build2
     // example, $($x ?  X : Y)) it will be empty (along with qual, which can
     // only be non-empty for a computed variable).
     //
+    // Note also that this function is (currently) not called by some lookup-
+    // like functions ($defined(), $config.origin()). But we should be careful
+    // if/when extending this and audit all the existing use-cases.
+    //
     virtual lookup
     lookup_variable (name&& qual, string&& name, const location&);
 
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