Rewrote --> to take a placeholder symbol as first argument

Instead of exporting cantedraw.lib.macro._ and making anyone who wants
to use the --> macro _require_ importing that specific symbol, let's
just make it so the user has to supply a placeholder name before they
do anything.  This means each package provides its own placeholder
symbol which lowers coupling.

1 files changed, 4 insertions, 3 deletions

diff --git a/main.lisp b/main.lisp
index af6312d..2bd3102 100644
--- a/main.lisp
+++ b/main.lisp
@@ -44,6 +44,7 @@
     inp))
 
 (defun start ()
-  (--> (read-until-integers)
-       (cons '+ _)
-       (format t "~a = ~a~%" _ (eval _))))
+  (--> var
+    (read-until-integers)
+    (cons '+ var)
+    (format t "~a = ~a~%" var (eval var))))