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Changes from Mercurial (hg http://isabelle.in.tum.de/repos/isabelle/ default)

Summary

  1. merged
  2. Enforced precodition "n <= length xs" to avoid relying on "hd []".
Changeset 70748:b3b84b71e398 by nipkow:
merged
Changeset 70747:548420d389ea by nipkow:
Enforced precodition &quot;n &lt;= length xs&quot; to avoid relying on &quot;hd []&quot;.
The file was modified src/HOL/Data_Structures/Balance.thy