diff --git a/src/ast.scm b/src/ast.scm
index 88965751c624f..c31f30ea741d9 100644
--- a/src/ast.scm
+++ b/src/ast.scm
@@ -23,7 +23,7 @@
                      (string #\( (deparse (caddr e)) #\)))))
         ((memq (car e) '(... |'| |.'|))
          (string (deparse (cadr e)) (car e)))
-        ((syntactic-op? (car e))
+        ((or (syntactic-op? (car e)) (eq? (car e) '|<:|) (eq? (car e) '|>:|))
          (string (deparse (cadr e)) (car e) (deparse (caddr e))))
         ((memq (car e) '($ &))
          (string (car e) (deparse (cadr e))))
@@ -44,7 +44,8 @@
                  (if (symbol? (cadr e))
                      (string ":" (deparse (cadr e)))
                      (string ":(" (deparse (cadr e)) ")")))
-                ((vcat)   (string #\[ (deparse-arglist (cdr e)) #\]))
+                ((vect)   (string #\[ (deparse-arglist (cdr e)) #\]))
+                ((vcat)   (string #\[ (deparse-arglist (cdr e) ";") #\]))
                 ((hcat)   (string #\[ (deparse-arglist (cdr e) " ") #\]))
                 ((global local const)
                  (string (car e) " " (deparse (cadr e))))
@@ -65,6 +66,10 @@
                                            (cdr e))
                                       "\n")
                          "\nend"))
+                ((comprehension)
+                 (string "[ " (deparse (cadr e)) " for " (deparse-arglist (cddr e) ", ") " ]"))
+                ((generator)
+                 (string "(" (deparse (cadr e)) " for " (deparse-arglist (cddr e) ", ") ")"))
                 (else
                  (string e))))))