generic_erb.rb: explicit_trim_line

* tool/generic_erb.rb: enable explicit_trim_line mode

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48304 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: no exception in QUOTE

* string.c (sym_printable): QUOTE() should not raise an exception
  even on invalid byte sequence.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_pack.rb: test_invalid_warning

* test/ruby/test_pack.rb (test_invalid_warning): add test for
  invalid directive warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48306 b2dd03c8-39d4-4d8f-98ff-823fe69b080e