tests/run/i4947c.scala won't compile on Windows because AUX is reserved filename on Windows

[melekhove]

On Windows:
sbt:dotty> dotc tests\run\i4947c.scala

Generated files:
24.09.2018 15:56 928 Aux$.class
24.09.2018 15:56 642 Test$.class
24.09.2018 15:56 280 Test.class
24.09.2018 15:56 572 Test.tasty

On Linux:
sbt:dotty> dotc tests/run/i4947c.scala

Generated files:
-rw-r--r-- 1 mev users 262 Sep 24 16:12 Aux.class
-rw-r--r-- 1 mev users 928 Sep 24 16:12 Aux$.class
-rw-r--r-- 1 mev users 790 Sep 24 16:12 Aux.tasty
-rw-r--r-- 1 mev users 280 Sep 24 16:12 Test.class
-rw-r--r-- 1 mev users 642 Sep 24 16:12 Test$.class
-rw-r--r-- 1 mev users 572 Sep 24 16:12 Test.tasty

[melekhove]

In order to fix it Aux class in i4947c.scala should be renamed to Aux_ for example