From: Tim Vaughan <tgvaughan@gmail.com>
Date: Wed, 31 May 2017 09:39:52 +0000 (+1200)
Subject: Implemented let*
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=commitdiff_plain;h=7575297b49c6d06e524b9dff038083a863720b53;p=scheme.forth.jl.git

Implemented let*
---

diff --git a/src/scheme-library.scm b/src/scheme-library.scm
index 2c6146e..a420c70 100644
--- a/src/scheme-library.scm
+++ b/src/scheme-library.scm
@@ -253,6 +253,14 @@
               `((lambda ,(map (lambda (x) (car x)) args)
                  ,@body) ,@(map (lambda (x) (cadr x)) args)))
 
+; let*
+
+(define-macro (let* args . body)
+              (if (null? args)
+                `(let () ,@body)
+                `(let (,(car args))
+                   (let* ,(cdr args) ,@body))))
+
 ; while
 
 (define-macro (while condition . body)
diff --git a/src/scheme.4th b/src/scheme.4th
index 6e2c492..d0bca19 100644
--- a/src/scheme.4th
+++ b/src/scheme.4th
@@ -1652,7 +1652,7 @@ hide env
                 R> drop ['] eval goto-deferred  \ Tail call optimization
             endof
 
-            except-message: ." object not applicable." recoverable-exception throw
+            except-message: ." object '" drop print ." ' not applicable." recoverable-exception throw
         endcase
 ;