2735 - define recipes using 'def'

I'm dropping all mention of 'recipe' terminology from the Readme. That
way I hope to avoid further bike-shedding discussions while I very
slowly decide on the right terminology with my students.

I could be smarter in my error messages and use 'recipe' when code uses
it and 'function' otherwise. But what about other words like ingredient?
It would all add complexity that I'm not yet sure is worthwhile. But I
do want separate experiences for veteran programmers reading about Mu on
github and for people learning programming using Mu.

1 files changed, 3 insertions, 3 deletions

diff --git a/factorial.mu b/factorial.mu
index 02a4e2b0..14e85140 100644
--- a/factorial.mu
+++ b/factorial.mu
@@ -1,20 +1,20 @@
 # example program: compute the factorial of 5
 
-recipe main [
+def main [
   local-scope
   x:number <- factorial 5
   $print [result: ], x, [ 
 ]
 ]
 
-recipe factorial n:number -> result:number [
+def factorial n:number -> result:number [
   local-scope
   load-ingredients
   {
     # if n=0 return 1
     zero?:boolean <- equal n, 0
     break-unless zero?
-    reply 1
+    return 1
   }
   # return n * factorial(n-1)
   x:number <- subtract n, 1