Update Filter-Util-Call to CPAN version 1.57

  [DELTA]

1.57 2017-01-22 rurban
----
  * Todo the t/exec.t test 2 on cygwin.
  * Fixed/Todo the t/decrypt.t test 7 utf8 failures.
    Skip with non UTF-8 locale.

1.56 2017-01-20 rurban
----

  * add binmode to the decrypt/encr,decrypt sample scripts
  * add utf8-encoded testcase to t/decrypt.t [cpan #110921]. use -C
  * stabilized some tests, add diag to sometimes failing sh tests
  * moved filter-util.pl to t/
  * fixed INSTALLDIRS back to site since 5.12 [gh #2]
  * fixed exec/sh test races using the same temp. filenames
  * reversed this Changes file to latest first
  * added Travis CI

1 files changed, 4 insertions, 2 deletions

diff --git a/pod/perlfilter.pod b/pod/perlfilter.pod
index f81ee8a1c0..60d086401c 100644
--- a/pod/perlfilter.pod
+++ b/pod/perlfilter.pod
@@ -562,9 +562,11 @@ or the byteloader, to translate binary code back to source code.
 See for example the limitations in L<Switch>, which uses source filters,
 and thus is does not work inside a string eval, the presence of
 regexes with embedded newlines that are specified with raw C</.../>
-delimiters and don't have a modifier C</x> are indistinguishable from
+delimiters and don't have a modifier C<//x> are indistinguishable from
 code chunks beginning with the division operator C</>. As a workaround
-you must use C<m/.../> or C<m?...?> for such patterns.  See
+you must use C<m/.../> or C<m?...?> for such patterns. Also, the presence of
+regexes specified with raw C<?...?> delimiters may cause mysterious
+errors. The workaround is to use C<m?...?> instead.  See
 L<http://search.cpan.org/perldoc?Switch#LIMITATIONS>
 
 Currently the content of the C<__DATA__> block is not filtered.