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-rw-r--r--doc/concepts/expressions.org4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/concepts/expressions.org b/doc/concepts/expressions.org
index cfe058ba..c8d2a9a5 100644
--- a/doc/concepts/expressions.org
+++ b/doc/concepts/expressions.org
@@ -253,7 +253,9 @@ those) argument(s) to obtain the final result.
argument ~"flat"~ (default ~false~) evaluates to a true value,
the keys are instead replaced by the path concatenation of the
~"subdir"~ argument and the base name of the old key. It is an
- error if conflicts occur in this way.
+ error if conflicts occur in this way; in case of such a user
+ error, the argument ~"msg"~ is also evaluated and the result
+ of that evaluatino reported in the error message.
***** Binary functions