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-rw-r--r--txr.19
1 files changed, 7 insertions, 2 deletions
diff --git a/txr.1 b/txr.1
index ed5832c5..f8197650 100644
--- a/txr.1
+++ b/txr.1
@@ -3021,8 +3021,13 @@ Example:
Output: fun="horizontal"
-A call made in a clearly horizontal context will ignore
-the vertical definition, if any, and require the horizontal function.
+A call made in a clearly horizontal context will prefer the
+horizontal function, and only fall back on the vertical one
+if the horizontal one doesn't exist. (In this fall-back case,
+the vertical function is called with empty data; it is useful
+for calling vertical functions which process arguments and
+produce values.)
+
In the next example, the call is followed by trailing material,
placing it in a horizontal context. Leading material will
do the same thing: