Test: stressing the relabelling.
Test: stressing the relabelling.

Initially, I wrote this for fun. However, it might be interesting to
test the Relabel tactic. This hits two rough edges:
  * 'refine' is abstracted over the whole context of parameters, while
    we would expect the same context than the let-definition(?)
  * it behaves strangely after a (dependent) elimination




mietek/epigram2,mietek/epigram2,larrytheliquid/pigit