Update ICU to 58.1

source/common/unicode/uchar.h

Index: source/common/unicode/uchar.h
diff --git a/source/common/unicode/uchar.h b/source/common/unicode/uchar.h
index 1836f92713afbe5c38fdd15eba33538b0e44cf3d..7f6ea6d9343ab7dec18aad5e5d2f46c26bf366db 100644
--- a/source/common/unicode/uchar.h
+++ b/source/common/unicode/uchar.h
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 **********************************************************************
 *   Copyright (C) 1997-2016, International Business Machines
@@ -39,7 +41,7 @@ U_CDECL_BEGIN
  * @see u_getUnicodeVersion
  * @stable ICU 2.0
  */
-#define U_UNICODE_VERSION "8.0"
+#define U_UNICODE_VERSION "9.0"
 
 /**
  * \file
@@ -397,6 +399,7 @@ typedef enum UProperty {
     UCHAR_CHANGES_WHEN_CASEMAPPED=55,
     /** Binary property Changes_When_NFKC_Casefolded. @stable ICU 4.4 */
     UCHAR_CHANGES_WHEN_NFKC_CASEFOLDED=56,
+#ifndef U_HIDE_DRAFT_API
     /**
      * Binary property Emoji.
      * See http://www.unicode.org/reports/tr51/#Emoji_Properties
@@ -425,8 +428,14 @@ typedef enum UProperty {
      * @draft ICU 57
      */
     UCHAR_EMOJI_MODIFIER_BASE=60,
-    /** One more than the last constant for binary Unicode properties. @stable ICU 2.1 */
+#endif /* U_HIDE_DRAFT_API */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for binary Unicode properties.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_BINARY_LIMIT=61,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** Enumerated property Bidi_Class.
         Same as u_charDirection, returns UCharDirection values. @stable ICU 2.2 */
@@ -513,8 +522,13 @@ typedef enum UProperty {
         (http://www.unicode.org/reports/tr9/)
         Returns UBidiPairedBracketType values. @stable ICU 52 */
     UCHAR_BIDI_PAIRED_BRACKET_TYPE=0x1015,
-    /** One more than the last constant for enumerated/integer Unicode properties. @stable ICU 2.2 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for enumerated/integer Unicode properties.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_INT_LIMIT=0x1016,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** Bitmask property General_Category_Mask.
         This is the General_Category property returned as a bit mask.
@@ -527,16 +541,26 @@ typedef enum UProperty {
     UCHAR_GENERAL_CATEGORY_MASK=0x2000,
     /** First constant for bit-mask Unicode properties. @stable ICU 2.4 */
     UCHAR_MASK_START=UCHAR_GENERAL_CATEGORY_MASK,
-    /** One more than the last constant for bit-mask Unicode properties. @stable ICU 2.4 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for bit-mask Unicode properties.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_MASK_LIMIT=0x2001,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** Double property Numeric_Value.
         Corresponds to u_getNumericValue. @stable ICU 2.4 */
     UCHAR_NUMERIC_VALUE=0x3000,
     /** First constant for double Unicode properties. @stable ICU 2.4 */
     UCHAR_DOUBLE_START=UCHAR_NUMERIC_VALUE,
-    /** One more than the last constant for double Unicode properties. @stable ICU 2.4 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for double Unicode properties.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_DOUBLE_LIMIT=0x3001,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** String property Age.
         Corresponds to u_charAge. @stable ICU 2.4 */
@@ -588,8 +612,13 @@ typedef enum UProperty {
     /** String property Bidi_Paired_Bracket (new in Unicode 6.3).
         Corresponds to u_getBidiPairedBracket. @stable ICU 52 */
     UCHAR_BIDI_PAIRED_BRACKET=0x400D,
-    /** One more than the last constant for string Unicode properties. @stable ICU 2.4 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for string Unicode properties.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_STRING_LIMIT=0x400E,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** Miscellaneous property Script_Extensions (new in Unicode 6.0).
         Some characters are commonly used in multiple scripts.
@@ -599,9 +628,14 @@ typedef enum UProperty {
     UCHAR_SCRIPT_EXTENSIONS=0x7000,
     /** First constant for Unicode properties with unusual value types. @stable ICU 4.6 */
     UCHAR_OTHER_PROPERTY_START=UCHAR_SCRIPT_EXTENSIONS,
-    /** One more than the last constant for Unicode properties with unusual value types.
-     * @stable ICU 4.6 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the last constant for Unicode properties with unusual value types.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     UCHAR_OTHER_PROPERTY_LIMIT=0x7001,
+#endif  // U_HIDE_DEPRECATED_API
+
     /** Represents a nonexistent or invalid property or property value. @stable ICU 2.4 */
     UCHAR_INVALID_CODE = -1
 } UProperty;
@@ -682,7 +716,13 @@ typedef enum UCharCategory
     U_INITIAL_PUNCTUATION     = 28,
     /** Pf @stable ICU 2.0 */
     U_FINAL_PUNCTUATION       = 29,
-    /** One higher than the last enum UCharCategory constant. @stable ICU 2.0 */
+    /**
+     * One higher than the last enum UCharCategory constant.
+     * This numeric value is stable (will not change), see
+     * http://www.unicode.org/policies/stability_policy.html#Property_Value
+     *
+     * @stable ICU 2.0
+     */
     U_CHAR_CATEGORY_COUNT
 } UCharCategory;
 
@@ -856,8 +896,15 @@ typedef enum UCharDirection {
     U_RIGHT_TO_LEFT_ISOLATE       = 21,
     /** PDI @stable ICU 52 */
     U_POP_DIRECTIONAL_ISOLATE     = 22,
-    /** @stable ICU 2.0 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest UCharDirection value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_BIDI_CLASS).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_CHAR_DIRECTION_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UCharDirection;
 
 /**
@@ -879,8 +926,15 @@ typedef enum UBidiPairedBracketType {
     U_BPT_OPEN,
     /** Close paired bracket. @stable ICU 52 */
     U_BPT_CLOSE,
-    /** @stable ICU 52 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UBidiPairedBracketType value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_BIDI_PAIRED_BRACKET_TYPE).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_BPT_COUNT /* 3 */
+#endif  // U_HIDE_DEPRECATED_API
 } UBidiPairedBracketType;
 
 /**
@@ -1211,7 +1265,7 @@ enum UBlockCode {
      * Unicode 4.0.1 renames the "Cyrillic Supplementary" block to "Cyrillic Supplement".
      * @stable ICU 2.2
      */
-    UBLOCK_CYRILLIC_SUPPLEMENTARY = UBLOCK_CYRILLIC_SUPPLEMENT, 
+    UBLOCK_CYRILLIC_SUPPLEMENTARY = UBLOCK_CYRILLIC_SUPPLEMENT,
     /** @stable ICU 2.2 */
     UBLOCK_TAGALOG = 98, /*[1700]*/
     /** @stable ICU 2.2 */
@@ -1570,8 +1624,40 @@ enum UBlockCode {
     /** @stable ICU 56 */
     UBLOCK_SUTTON_SIGNWRITING = 262, /*[1D800]*/
 
-    /** @stable ICU 2.0 */
-    UBLOCK_COUNT = 263,
+    /* New blocks in Unicode 9.0 */
+
+    /** @stable ICU 58 */
+    UBLOCK_ADLAM = 263, /*[1E900]*/
+    /** @stable ICU 58 */
+    UBLOCK_BHAIKSUKI = 264, /*[11C00]*/
+    /** @stable ICU 58 */
+    UBLOCK_CYRILLIC_EXTENDED_C = 265, /*[1C80]*/
+    /** @stable ICU 58 */
+    UBLOCK_GLAGOLITIC_SUPPLEMENT = 266, /*[1E000]*/
+    /** @stable ICU 58 */
+    UBLOCK_IDEOGRAPHIC_SYMBOLS_AND_PUNCTUATION = 267, /*[16FE0]*/
+    /** @stable ICU 58 */
+    UBLOCK_MARCHEN = 268, /*[11C70]*/
+    /** @stable ICU 58 */
+    UBLOCK_MONGOLIAN_SUPPLEMENT = 269, /*[11660]*/
+    /** @stable ICU 58 */
+    UBLOCK_NEWA = 270, /*[11400]*/
+    /** @stable ICU 58 */
+    UBLOCK_OSAGE = 271, /*[104B0]*/
+    /** @stable ICU 58 */
+    UBLOCK_TANGUT = 272, /*[17000]*/
+    /** @stable ICU 58 */
+    UBLOCK_TANGUT_COMPONENTS = 273, /*[18800]*/
+
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UBlockCode value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_BLOCK).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    UBLOCK_COUNT = 274,
+#endif  // U_HIDE_DEPRECATED_API
 
     /** @stable ICU 2.0 */
     UBLOCK_INVALID_CODE=-1
@@ -1600,7 +1686,15 @@ typedef enum UEastAsianWidth {
     U_EA_FULLWIDTH, /*[F]*/
     U_EA_NARROW,    /*[Na]*/
     U_EA_WIDE,      /*[W]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UEastAsianWidth value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_EAST_ASIAN_WIDTH).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_EA_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UEastAsianWidth;
 
 /**
@@ -1617,7 +1711,7 @@ typedef enum UEastAsianWidth {
 typedef enum UCharNameChoice {
     /** Unicode character name (Name property). @stable ICU 2.0 */
     U_UNICODE_CHAR_NAME,
-#ifndef U_HIDE_DEPRECATED_API 
+#ifndef U_HIDE_DEPRECATED_API
     /**
      * The Unicode_1_Name property value which is of little practical value.
      * Beginning with ICU 49, ICU APIs return an empty string for this name choice.
@@ -1629,8 +1723,13 @@ typedef enum UCharNameChoice {
     U_EXTENDED_CHAR_NAME = U_UNICODE_CHAR_NAME+2,
     /** Corrected name from NameAliases.txt. @stable ICU 4.4 */
     U_CHAR_NAME_ALIAS,
-    /** @stable ICU 2.0 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UCharNameChoice value.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_CHAR_NAME_CHOICE_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UCharNameChoice;
 
 /**
@@ -1649,7 +1748,13 @@ typedef enum UCharNameChoice {
 typedef enum UPropertyNameChoice {
     U_SHORT_PROPERTY_NAME,
     U_LONG_PROPERTY_NAME,
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UPropertyNameChoice value.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_PROPERTY_NAME_CHOICE_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UPropertyNameChoice;
 
 /**
@@ -1683,7 +1788,15 @@ typedef enum UDecompositionType {
     U_DT_SUPER,             /*[sup]*/
     U_DT_VERTICAL,          /*[vert]*/
     U_DT_WIDE,              /*[wide]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UDecompositionType value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_DECOMPOSITION_TYPE).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_DT_COUNT /* 18 */
+#endif  // U_HIDE_DEPRECATED_API
 } UDecompositionType;
 
 /**
@@ -1705,7 +1818,15 @@ typedef enum UJoiningType {
     U_JT_LEFT_JOINING,      /*[L]*/
     U_JT_RIGHT_JOINING,     /*[R]*/
     U_JT_TRANSPARENT,       /*[T]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UJoiningType value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_JOINING_TYPE).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_JT_COUNT /* 6 */
+#endif  // U_HIDE_DEPRECATED_API
 } UJoiningType;
 
 /**
@@ -1808,7 +1929,18 @@ typedef enum UJoiningGroup {
     U_JG_MANICHAEAN_YODH,  /**< @stable ICU 54 */
     U_JG_MANICHAEAN_ZAYIN,  /**< @stable ICU 54 */
     U_JG_STRAIGHT_WAW,  /**< @stable ICU 54 */
+    U_JG_AFRICAN_FEH,  /**< @stable ICU 58 */
+    U_JG_AFRICAN_NOON,  /**< @stable ICU 58 */
+    U_JG_AFRICAN_QAF,  /**< @stable ICU 58 */
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UJoiningGroup value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_JOINING_GROUP).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_JG_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UJoiningGroup;
 
 /**
@@ -1834,10 +1966,31 @@ typedef enum UGraphemeClusterBreak {
     U_GCB_LVT = 7,              /*[LVT]*/
     U_GCB_T = 8,                /*[T]*/
     U_GCB_V = 9,                /*[V]*/
+    /** @stable ICU 4.0 */
     U_GCB_SPACING_MARK = 10,    /*[SM]*/ /* from here on: new in Unicode 5.1/ICU 4.0 */
+    /** @stable ICU 4.0 */
     U_GCB_PREPEND = 11,         /*[PP]*/
+    /** @stable ICU 50 */
     U_GCB_REGIONAL_INDICATOR = 12,  /*[RI]*/ /* new in Unicode 6.2/ICU 50 */
-    U_GCB_COUNT = 13
+    /** @stable ICU 58 */
+    U_GCB_E_BASE = 13,          /*[EB]*/ /* from here on: new in Unicode 9.0/ICU 58 */
+    /** @stable ICU 58 */
+    U_GCB_E_BASE_GAZ = 14,      /*[EBG]*/
+    /** @stable ICU 58 */
+    U_GCB_E_MODIFIER = 15,      /*[EM]*/
+    /** @stable ICU 58 */
+    U_GCB_GLUE_AFTER_ZWJ = 16,  /*[GAZ]*/
+    /** @stable ICU 58 */
+    U_GCB_ZWJ = 17,             /*[ZWJ]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UGraphemeClusterBreak value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_GRAPHEME_CLUSTER_BREAK).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    U_GCB_COUNT = 18
+#endif  // U_HIDE_DEPRECATED_API
 } UGraphemeClusterBreak;
 
 /**
@@ -1862,16 +2015,43 @@ typedef enum UWordBreakValues {
     U_WB_MIDNUM = 5,            /*[MN]*/
     U_WB_NUMERIC = 6,           /*[NU]*/
     U_WB_EXTENDNUMLET = 7,      /*[EX]*/
+    /** @stable ICU 4.0 */
     U_WB_CR = 8,                /*[CR]*/ /* from here on: new in Unicode 5.1/ICU 4.0 */
+    /** @stable ICU 4.0 */
     U_WB_EXTEND = 9,            /*[Extend]*/
+    /** @stable ICU 4.0 */
     U_WB_LF = 10,               /*[LF]*/
+    /** @stable ICU 4.0 */
     U_WB_MIDNUMLET =11,         /*[MB]*/
+    /** @stable ICU 4.0 */
     U_WB_NEWLINE =12,           /*[NL]*/
+    /** @stable ICU 50 */
     U_WB_REGIONAL_INDICATOR = 13,   /*[RI]*/ /* new in Unicode 6.2/ICU 50 */
+    /** @stable ICU 52 */
     U_WB_HEBREW_LETTER = 14,    /*[HL]*/ /* from here on: new in Unicode 6.3/ICU 52 */
+    /** @stable ICU 52 */
     U_WB_SINGLE_QUOTE = 15,     /*[SQ]*/
+    /** @stable ICU 52 */
     U_WB_DOUBLE_QUOTE = 16,     /*[DQ]*/
-    U_WB_COUNT = 17
+    /** @stable ICU 58 */
+    U_WB_E_BASE = 17,           /*[EB]*/ /* from here on: new in Unicode 9.0/ICU 58 */
+    /** @stable ICU 58 */
+    U_WB_E_BASE_GAZ = 18,       /*[EBG]*/
+    /** @stable ICU 58 */
+    U_WB_E_MODIFIER = 19,       /*[EM]*/
+    /** @stable ICU 58 */
+    U_WB_GLUE_AFTER_ZWJ = 20,   /*[GAZ]*/
+    /** @stable ICU 58 */
+    U_WB_ZWJ = 21,              /*[ZWJ]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UWordBreakValues value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_WORD_BREAK).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    U_WB_COUNT = 22
+#endif  // U_HIDE_DEPRECATED_API
 } UWordBreakValues;
 
 /**
@@ -1902,7 +2082,15 @@ typedef enum USentenceBreak {
     U_SB_EXTEND = 12,           /*[EX]*/
     U_SB_LF = 13,               /*[LF]*/
     U_SB_SCONTINUE = 14,        /*[SC]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal USentenceBreak value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_SENTENCE_BREAK).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_SB_COUNT = 15
+#endif  // U_HIDE_DEPRECATED_API
 } USentenceBreak;
 
 /**
@@ -1949,18 +2137,43 @@ typedef enum ULineBreak {
     U_LB_SPACE = 26,             /*[SP]*/
     U_LB_BREAK_SYMBOLS = 27,     /*[SY]*/
     U_LB_ZWSPACE = 28,           /*[ZW]*/
+    /** @stable ICU 2.6 */
     U_LB_NEXT_LINE = 29,         /*[NL]*/ /* from here on: new in Unicode 4/ICU 2.6 */
+    /** @stable ICU 2.6 */
     U_LB_WORD_JOINER = 30,       /*[WJ]*/
+    /** @stable ICU 3.4 */
     U_LB_H2 = 31,                /*[H2]*/ /* from here on: new in Unicode 4.1/ICU 3.4 */
+    /** @stable ICU 3.4 */
     U_LB_H3 = 32,                /*[H3]*/
+    /** @stable ICU 3.4 */
     U_LB_JL = 33,                /*[JL]*/
+    /** @stable ICU 3.4 */
     U_LB_JT = 34,                /*[JT]*/
+    /** @stable ICU 3.4 */
     U_LB_JV = 35,                /*[JV]*/
+    /** @stable ICU 4.4 */
     U_LB_CLOSE_PARENTHESIS = 36, /*[CP]*/ /* new in Unicode 5.2/ICU 4.4 */
+    /** @stable ICU 49 */
     U_LB_CONDITIONAL_JAPANESE_STARTER = 37,/*[CJ]*/ /* new in Unicode 6.1/ICU 49 */
+    /** @stable ICU 49 */
     U_LB_HEBREW_LETTER = 38,     /*[HL]*/ /* new in Unicode 6.1/ICU 49 */
+    /** @stable ICU 50 */
     U_LB_REGIONAL_INDICATOR = 39,/*[RI]*/ /* new in Unicode 6.2/ICU 50 */
-    U_LB_COUNT = 40
+    /** @stable ICU 58 */
+    U_LB_E_BASE = 40,            /*[EB]*/ /* from here on: new in Unicode 9.0/ICU 58 */
+    /** @stable ICU 58 */
+    U_LB_E_MODIFIER = 41,        /*[EM]*/
+    /** @stable ICU 58 */
+    U_LB_ZWJ = 42,               /*[ZWJ]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal ULineBreak value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_LINE_BREAK).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    U_LB_COUNT = 43
+#endif  // U_HIDE_DEPRECATED_API
 } ULineBreak;
 
 /**
@@ -1980,7 +2193,15 @@ typedef enum UNumericType {
     U_NT_DECIMAL,           /*[de]*/
     U_NT_DIGIT,             /*[di]*/
     U_NT_NUMERIC,           /*[nu]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UNumericType value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_NUMERIC_TYPE).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_NT_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UNumericType;
 
 /**
@@ -2002,7 +2223,15 @@ typedef enum UHangulSyllableType {
     U_HST_TRAILING_JAMO,    /*[T]*/
     U_HST_LV_SYLLABLE,      /*[LV]*/
     U_HST_LVT_SYLLABLE,     /*[LVT]*/
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UHangulSyllableType value.
+     * The highest value is available via u_getIntPropertyMaxValue(UCHAR_HANGUL_SYLLABLE_TYPE).
+     *
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
     U_HST_COUNT
+#endif  // U_HIDE_DEPRECATED_API
 } UHangulSyllableType;
 
 /**
@@ -2867,7 +3096,7 @@ u_charName(UChar32 code, UCharNameChoice nameChoice,
            char *buffer, int32_t bufferLength,
            UErrorCode *pErrorCode);
 
-#ifndef U_HIDE_DEPRECATED_API 
+#ifndef U_HIDE_DEPRECATED_API
 /**
  * Returns an empty string.
  * Used to return the ISO 10646 comment for a character.