[isabelle] fast_lin_arith raises Fail

In the attached theory, auto first generates a number of warnings of the from

  Linear arithmetic should have refuted the assumptions.
  Please inform Tobias Nipkow.

before it crashes with an exception Fail
(line 503 of "~~/src/Provers/Arith/fast_lin_arith.ML"):
Linear arithmetic: failed to add thms

Tested with Isabelle2014 and Isabelle2015-RC1.


Attachment: Scratch.thy
Description: application/example

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