Now, `dsimp` fails if the goal did not change.
We can use the config object to obtain the previous behavior:
```
dsimp {fail_if_unchaged := ff}
```
See comment https://github.com/leanprover/lean/issues/1694#issuecomment-310956315
at issue #1694
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| basic.lean | ||
| default.lean | ||
| instances.lean | ||
| lemmas.lean | ||
| qsort.lean | ||