doc: mention whitespace issue in infix

* txr.1: Make it clear that whitespace is required between
atoms in infix expressions most of the time, so certain
compact notations from C-like syntax are not achieved.

1 files changed, 13 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index 3d4d367d..b2b01fb9 100644
--- a/txr.1
+++ b/txr.1
@@ -54120,6 +54120,19 @@ which means that it is notated with parentheses:
 Informally speaking, the Infix Syntax feature does not eliminate the
 outer parentheses.
 
+Whitespace is required between atoms in infix expressions, because
+they are ordinary Lisp lists. The infix feature does not introduce
+any new token-level syntax. The expression
+.code "(b + a ++)"
+cannot be written
+.code "(b+a++)"
+or
+.codn "(b + a++)" .
+In situations where parentheses or braces are adjacent to
+each other or to an atom, spaces may be elided, as allowed by
+Lisp syntax, exemplified by:
+.codn "(log(a[i][j]++))" .
+
 .NP* Operator Table
 
 .TS