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_utf8.vim

@@ -0,0 +1,35 @@
+" Tests for regexp in utf8 encoding
+if !has('multi_byte')
+  finish
+endif
+set encoding=utf-8
+scriptencoding utf-8
+
+func s:equivalence_test()
+  let str = "AÀÁÂÃÄÅĀĂĄǍǞǠẢ BḂḆ CÇĆĈĊČ DĎĐḊḎḐ EÈÉÊËĒĔĖĘĚẺẼ FḞ GĜĞĠĢǤǦǴḠ HĤĦḢḦḨ IÌÍÎÏĨĪĬĮİǏỈ JĴ KĶǨḰḴ LĹĻĽĿŁḺ MḾṀ NÑŃŅŇṄṈ OÒÓÔÕÖØŌŎŐƠǑǪǬỎ PṔṖ Q RŔŖŘṘṞ SŚŜŞŠṠ TŢŤŦṪṮ UÙÚÛÜŨŪŬŮŰŲƯǓỦ VṼ WŴẀẂẄẆ XẊẌ YÝŶŸẎỲỶỸ ZŹŻŽƵẐẔ aàáâãäåāăąǎǟǡả bḃḇ cçćĉċč dďđḋḏḑ eèéêëēĕėęěẻẽ fḟ gĝğġģǥǧǵḡ hĥħḣḧḩẖ iìíîïĩīĭįǐỉ jĵǰ kķǩḱḵ lĺļľŀłḻ mḿṁ nñńņňʼnṅṉ oòóôõöøōŏőơǒǫǭỏ pṕṗ q rŕŗřṙṟ sśŝşšṡ tţťŧṫṯẗ uùúûüũūŭůűųưǔủ vṽ wŵẁẃẅẇẘ xẋẍ yýÿŷẏẙỳỷỹ zźżžƶẑẕ"
+  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
+	    " 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