Before running a test case named testcase/1, common_test will call
testcase/0 (the info function). Exceptions and illegal return values
would be silently ignored. In a planned update to common_test, errors
will instead cause the test case to fail.

The test case otp_8949_a/1 has a helper function called otp_8949_a/0.
Rename it to do_otp_8949_a/0.

While at it, also fix a copy and paste bug in the list of test cases.
otp_8949_a was run twice; otp_8949_b was never run.

* fenollp/treewide_remove_unexpected_0xff/OTP-11323:
  Remove ^L characters hidden randomly in the code. Not those used in text files as delimiters.

While working on a tool that processes Erlang code and testing it against this repo,
I found out about those little sneaky 0xff. I thought it may be of help to other
people build such tools to remove non-conforming-to-standard characters.

Commit 60984ade updated the code, but not the type spec.

Noticed-by: Kostis Sagonas

* bjorn/xml-encoding-fix/OTP-11310:
  Change encoding of troublesome notes.xml files to utf-8
  Convert some notes.xml files from latin-1 to utf-8

Most notes.xml files will be updated in every release and cause
the kind of the problems described in the previous commit.

ErrorInfo is documented to be:

  {ErrorLine,Module,ErrorDescriptor}

but for some errors with line numbers it would look like:

  {Module,ErrorDescriptor}

Ensure that all ErrorInfo tuples have three elements. Use 'none'
instead of a line number:

  {none,Module,ErrorDescriptor}

There already are errors that return 'none' when no line number is
available, but that convention was not documented. Mention it in the
documentation.

Also make sure that the compiler will not print 'none' as a line
number in error messages (if the 'report_errors' option is given) as
that looks stupid. That is, when attempting to compile a non-existing
module, the error message should be:

  non-existing.erl: no such file or directory

and not:

  non-existing.erl:none: no such file or directory