Log analysis shows only dots from test runner

[oli-obk]

Happened in rust-lang/rust#53821 (comment)

Raw log: https://api.travis-ci.org/v3/job/422925643/log.txt

Shown snippet:

[00:52:06] ....................................................................................................
[00:52:09] ....................................................................................................
[00:52:12] ...............i....................................................................................
[00:52:15] ....................................................................................................
[00:52:17] ................................................................iiiiiiiii...........................
[00:52:23] ....................................................................................................
[00:52:26] ....................................................................................................
[00:52:29] ............................................i.......................................................
[00:52:32] ..............................................................................................i.i..i