From f1bd626bdb02170b189891d8f8f3f3cc6b592209 Mon Sep 17 00:00:00 2001
From: Tim Vaughan <tgvaughan@gmail.com>
Date: Mon, 12 Jun 2017 23:40:12 +1200
Subject: [PATCH] Added expression sequences to macro expander.

---
 src/scheme.4th | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/scheme.4th b/src/scheme.4th
index 67b656c..0722208 100644
--- a/src/scheme.4th
+++ b/src/scheme.4th
@@ -1757,12 +1757,9 @@ hide env
 defer expand
 
 : expand-quasiquote ;
-: expand-definition ;
-: expand-assignment ;
 : expand-define-macro ;
 : expand-if ;
 : expand-lambda ;
-: expand-begin ;
 : expand-application ;
 
 : expand-macro ( exp -- result )
@@ -1801,6 +1798,27 @@ defer expand
 
     cons cons cons ;
 
+: expand-sequence ( exp -- res )
+    nil? if exit then
+
+    2dup car expand
+    2swap cdr recurse
+
+    cons ;
+
+: expand-begin ( exp -- res )
+    begin-symbol 2swap
+    begin-actions expand-sequence
+
+    cons ;
+
+: expand-lambda ( exp -- res )
+    lambda-symbol 2swap
+    2dup lambda-parameters
+    2swap lambda-body expand-sequence
+
+    cons cons ;
+
 :noname ( exp -- result )
 
     expand-macro
-- 
2.20.1