patch 7.4.1700

Problem:    Equivalence classes are not properly tested.
Solution:   Add tests for multi-byte and latin1. Fix an error. (Owen Leibman)

src/testdir/test_regexp_latin.vim

@@ -0,0 +1,32 @@
+" Tests for regexp in latin1 encoding
+set encoding=latin1
+scriptencoding latin1
+
+func s:equivalence_test()
+  let str = "A<><41><EFBFBD><EFBFBD><EFBFBD><EFBFBD> B C D E<><45><EFBFBD><EFBFBD> F G H I<><49><EFBFBD><EFBFBD> J K L M N<> O<><4F><EFBFBD><EFBFBD><EFBFBD><EFBFBD> P Q R S T U<><55><EFBFBD><EFBFBD> V W X Y<> Z a<><61><EFBFBD><EFBFBD><EFBFBD><EFBFBD> b c d e<><65><EFBFBD><EFBFBD> f g h i<><69><EFBFBD><EFBFBD> j k l m n<> o<><6F><EFBFBD><EFBFBD><EFBFBD><EFBFBD> p q r s t u<><75><EFBFBD><EFBFBD> v w x y<><79> z"
+  let groups = split(str)
+  for group1 in groups
+      for c in split(group1, '\zs')
+	" next statement confirms that equivalence class matches every
+	" character in group
+        call assert_match('^[[=' . c . '=]]*$', group1)
+        for group2 in groups
+          if group2 != group1
+	    " next statement converts that equivalence class doesn't match
+	    " a character in any other group
+            call assert_equal(-1, match(group2, '[[=' . c . '=]]'))
+          endif
+        endfor
+      endfor
+  endfor
+endfunc
+
+func Test_equivalence_re1()
+  set re=1
+  call s:equivalence_test()
+endfunc
+
+func Test_equivalence_re2()
+  set re=2
+  call s:equivalence_test()
+endfunc