theory seq.Seq: added comment

97ca55d8 · Jean-Christophe Filliâtre · 51d21a9e · 97ca55d8
Commit 97ca55d8 authored Apr 17, 2015 by Jean-Christophe Filliâtre
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theories/seq.why theories/seq.why +4 -0

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--- a/theories/seq.why
+++ b/theories/seq.why
@@ -147,6 +147,10 @@ end

 (* TODO / TO DISCUSS

+  - add set
+
+      s[i <- v] = s when i < 0 || i >= length s?
+
  - what about s[i..j] when i..j is not a valid range?
    left undefined? empty sequence?