Error-index tests are spewing thousands of lines of errors

[alexcrichton]

I've noticed this recently on the Travis/AppVeyor logs, but I haven't tracked it down yet to see what caused it.

[alexcrichton]

Appears caused by #39199. @nikomatsakis perhaps caused by #39142?

[nikomatsakis]

@alexcrichton ummmmmmmmm perhaps..... the tests are not failing though? Do you have a link to an example?

[alexcrichton]

Oh right sorry I meant only that output is being generated, not that tests are failing. Most of the tests expect a failure which is the reason so many errors are printed.

An example is here (https://travis-ci.org/rust-lang/rust/jobs/192869604#L7886) from the logs of that PR (how nifty I can check that out!). You should be able to reproduce this locally as well via

./x.py test src/tools/error_index_generator