patches/cxx20enum.patch

diff --git a/source/common/characterproperties.cpp b/source/common/characterproperties.cpp
index a84996b4..a2e051a4 100644
--- a/source/common/characterproperties.cpp
+++ b/source/common/characterproperties.cpp
@@ -36,7 +36,7 @@ namespace {
 
 UBool U_CALLCONV characterproperties_cleanup();
 
-constexpr int32_t NUM_INCLUSIONS = UPROPS_SRC_COUNT + UCHAR_INT_LIMIT - UCHAR_INT_START;
+constexpr int32_t NUM_INCLUSIONS = UPROPS_SRC_COUNT + (UCHAR_INT_LIMIT - UCHAR_INT_START);
 
 struct Inclusion {
     UnicodeSet  *fSet = nullptr;
@@ -210,7 +210,7 @@ const UnicodeSet *getInclusionsForSource(UPropertySource src, UErrorCode &errorC
 void U_CALLCONV initIntPropInclusion(UProperty prop, UErrorCode &errorCode) {
     // This function is invoked only via umtx_initOnce().
     U_ASSERT(UCHAR_INT_START <= prop && prop < UCHAR_INT_LIMIT);
-    int32_t inclIndex = UPROPS_SRC_COUNT + prop - UCHAR_INT_START;
+    int32_t inclIndex = UPROPS_SRC_COUNT + (prop - UCHAR_INT_START);
     U_ASSERT(gInclusions[inclIndex].fSet == nullptr);
     UPropertySource src = uprops_getSource(prop);
     const UnicodeSet *incl = getInclusionsForSource(src, errorCode);
@@ -255,7 +255,7 @@ const UnicodeSet *CharacterProperties::getInclusionsForProperty(
         UProperty prop, UErrorCode &errorCode) {
     if (U_FAILURE(errorCode)) { return nullptr; }
     if (UCHAR_INT_START <= prop && prop < UCHAR_INT_LIMIT) {
-        int32_t inclIndex = UPROPS_SRC_COUNT + prop - UCHAR_INT_START;
+        int32_t inclIndex = UPROPS_SRC_COUNT + (prop - UCHAR_INT_START);
         Inclusion &i = gInclusions[inclIndex];
         umtx_initOnce(i.fInitOnce, &initIntPropInclusion, prop, errorCode);
         return i.fSet;
diff --git a/source/common/ruleiter.h b/source/common/ruleiter.h
index 09af1297..41731407 100644
--- a/source/common/ruleiter.h
+++ b/source/common/ruleiter.h
@@ -66,28 +66,28 @@ public:
     /**
      * Value returned when there are no more characters to iterate.
      */
-    enum { DONE = -1 };
+    static constexpr int32_t DONE = -1;
 
     /**
      * Bitmask option to enable parsing of variable names.  If (options &
      * PARSE_VARIABLES) != 0, then an embedded variable will be expanded to
      * its value.  Variables are parsed using the SymbolTable API.
      */
-    enum { PARSE_VARIABLES = 1 };
+    static constexpr int32_t PARSE_VARIABLES = 1;
 
     /**
      * Bitmask option to enable parsing of escape sequences.  If (options &
      * PARSE_ESCAPES) != 0, then an embedded escape sequence will be expanded
      * to its value.  Escapes are parsed using Utility.unescapeAt().
      */
-    enum { PARSE_ESCAPES   = 2 };
+    static constexpr int32_t PARSE_ESCAPES   = 2;
 
     /**
      * Bitmask option to enable skipping of whitespace.  If (options &
      * SKIP_WHITESPACE) != 0, then Pattern_White_Space characters will be silently
      * skipped, as if they were not present in the input.
      */
-    enum { SKIP_WHITESPACE = 4 };
+    static constexpr int32_t SKIP_WHITESPACE = 4;
 
     /**
      * Constructs an iterator over the given text, starting at the given
diff --git a/source/common/ucptrie_impl.h b/source/common/ucptrie_impl.h
index 048353c8..a7a80a8f 100644
--- a/source/common/ucptrie_impl.h
+++ b/source/common/ucptrie_impl.h
@@ -54,80 +54,76 @@ struct UCPTrieHeader {
     uint16_t shiftedHighStart;
 };
 
+// Constants for use with UCPTrieHeader.options.
+constexpr uint16_t UCPTRIE_OPTIONS_DATA_LENGTH_MASK = 0xf000;
+constexpr uint16_t UCPTRIE_OPTIONS_DATA_NULL_OFFSET_MASK = 0xf00;
+constexpr uint16_t UCPTRIE_OPTIONS_RESERVED_MASK = 0x38;
+constexpr uint16_t UCPTRIE_OPTIONS_VALUE_BITS_MASK = 7;
+
 /**
- * Constants for use with UCPTrieHeader.options.
- * @internal
+ * Value for index3NullOffset which indicates that there is no index-3 null block.
+ * Bit 15 is unused for this value because this bit is used if the index-3 contains
+ * 18-bit indexes.
  */
-enum {
-    UCPTRIE_OPTIONS_DATA_LENGTH_MASK = 0xf000,
-    UCPTRIE_OPTIONS_DATA_NULL_OFFSET_MASK = 0xf00,
-    UCPTRIE_OPTIONS_RESERVED_MASK = 0x38,
-    UCPTRIE_OPTIONS_VALUE_BITS_MASK = 7,
-    /**
-     * Value for index3NullOffset which indicates that there is no index-3 null block.
-     * Bit 15 is unused for this value because this bit is used if the index-3 contains
-     * 18-bit indexes.
-     */
-    UCPTRIE_NO_INDEX3_NULL_OFFSET = 0x7fff,
-    UCPTRIE_NO_DATA_NULL_OFFSET = 0xfffff
-};
+constexpr int32_t UCPTRIE_NO_INDEX3_NULL_OFFSET = 0x7fff;
+constexpr int32_t UCPTRIE_NO_DATA_NULL_OFFSET = 0xfffff;
 
 // Internal constants.
-enum {
-    /** The length of the BMP index table. 1024=0x400 */
-    UCPTRIE_BMP_INDEX_LENGTH = 0x10000 >> UCPTRIE_FAST_SHIFT,
 
-    UCPTRIE_SMALL_LIMIT = 0x1000,
-    UCPTRIE_SMALL_INDEX_LENGTH = UCPTRIE_SMALL_LIMIT >> UCPTRIE_FAST_SHIFT,
+/** The length of the BMP index table. 1024=0x400 */
+constexpr int32_t UCPTRIE_BMP_INDEX_LENGTH = 0x10000 >> UCPTRIE_FAST_SHIFT;
 
-    /** Shift size for getting the index-3 table offset. */
-    UCPTRIE_SHIFT_3 = 4,
+constexpr int32_t UCPTRIE_SMALL_LIMIT = 0x1000;
+constexpr int32_t UCPTRIE_SMALL_INDEX_LENGTH = UCPTRIE_SMALL_LIMIT >> UCPTRIE_FAST_SHIFT;
 
-    /** Shift size for getting the index-2 table offset. */
-    UCPTRIE_SHIFT_2 = 5 + UCPTRIE_SHIFT_3,
+/** Shift size for getting the index-3 table offset. */
+constexpr int32_t UCPTRIE_SHIFT_3 = 4;
 
-    /** Shift size for getting the index-1 table offset. */
-    UCPTRIE_SHIFT_1 = 5 + UCPTRIE_SHIFT_2,
+/** Shift size for getting the index-2 table offset. */
+constexpr int32_t UCPTRIE_SHIFT_2 = 5 + UCPTRIE_SHIFT_3;
 
-    /**
-     * Difference between two shift sizes,
-     * for getting an index-2 offset from an index-3 offset. 5=9-4
-     */
-    UCPTRIE_SHIFT_2_3 = UCPTRIE_SHIFT_2 - UCPTRIE_SHIFT_3,
+/** Shift size for getting the index-1 table offset. */
+constexpr int32_t UCPTRIE_SHIFT_1 = 5 + UCPTRIE_SHIFT_2;
 
-    /**
-     * Difference between two shift sizes,
-     * for getting an index-1 offset from an index-2 offset. 5=14-9
-     */
-    UCPTRIE_SHIFT_1_2 = UCPTRIE_SHIFT_1 - UCPTRIE_SHIFT_2,
+/**
+ * Difference between two shift sizes,
+ * for getting an index-2 offset from an index-3 offset. 5=9-4
+ */
+constexpr int32_t UCPTRIE_SHIFT_2_3 = UCPTRIE_SHIFT_2 - UCPTRIE_SHIFT_3;
 
-    /**
-     * Number of index-1 entries for the BMP. (4)
-     * This part of the index-1 table is omitted from the serialized form.
-     */
-    UCPTRIE_OMITTED_BMP_INDEX_1_LENGTH = 0x10000 >> UCPTRIE_SHIFT_1,
+/**
+ * Difference between two shift sizes,
+ * for getting an index-1 offset from an index-2 offset. 5=14-9
+ */
+constexpr int32_t UCPTRIE_SHIFT_1_2 = UCPTRIE_SHIFT_1 - UCPTRIE_SHIFT_2;
 
-    /** Number of entries in an index-2 block. 32=0x20 */
-    UCPTRIE_INDEX_2_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_1_2,
+/**
+ * Number of index-1 entries for the BMP. (4)
+ * This part of the index-1 table is omitted from the serialized form.
+ */
+constexpr int32_t UCPTRIE_OMITTED_BMP_INDEX_1_LENGTH = 0x10000 >> UCPTRIE_SHIFT_1;
 
-    /** Mask for getting the lower bits for the in-index-2-block offset. */
-    UCPTRIE_INDEX_2_MASK = UCPTRIE_INDEX_2_BLOCK_LENGTH - 1,
+/** Number of entries in an index-2 block. 32=0x20 */
+constexpr int32_t UCPTRIE_INDEX_2_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_1_2;
 
-    /** Number of code points per index-2 table entry. 512=0x200 */
-    UCPTRIE_CP_PER_INDEX_2_ENTRY = 1 << UCPTRIE_SHIFT_2,
+/** Mask for getting the lower bits for the in-index-2-block offset. */
+constexpr int32_t UCPTRIE_INDEX_2_MASK = UCPTRIE_INDEX_2_BLOCK_LENGTH - 1;
 
-    /** Number of entries in an index-3 block. 32=0x20 */
-    UCPTRIE_INDEX_3_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_2_3,
+/** Number of code points per index-2 table entry. 512=0x200 */
+constexpr int32_t UCPTRIE_CP_PER_INDEX_2_ENTRY = 1 << UCPTRIE_SHIFT_2;
 
-    /** Mask for getting the lower bits for the in-index-3-block offset. */
-    UCPTRIE_INDEX_3_MASK = UCPTRIE_INDEX_3_BLOCK_LENGTH - 1,
+/** Number of entries in an index-3 block. 32=0x20 */
+constexpr int32_t UCPTRIE_INDEX_3_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_2_3;
 
-    /** Number of entries in a small data block. 16=0x10 */
-    UCPTRIE_SMALL_DATA_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_3,
+/** Mask for getting the lower bits for the in-index-3-block offset. */
+constexpr int32_t UCPTRIE_INDEX_3_MASK = UCPTRIE_INDEX_3_BLOCK_LENGTH - 1;
+
+/** Number of entries in a small data block. 16=0x10 */
+constexpr int32_t UCPTRIE_SMALL_DATA_BLOCK_LENGTH = 1 << UCPTRIE_SHIFT_3;
+
+/** Mask for getting the lower bits for the in-small-data-block offset. */
+constexpr int32_t UCPTRIE_SMALL_DATA_MASK = UCPTRIE_SMALL_DATA_BLOCK_LENGTH - 1;
 
-    /** Mask for getting the lower bits for the in-small-data-block offset. */
-    UCPTRIE_SMALL_DATA_MASK = UCPTRIE_SMALL_DATA_BLOCK_LENGTH - 1
-};
 
 typedef UChar32
 UCPTrieGetRange(const void *trie, UChar32 start,
diff --git a/source/i18n/coll.cpp b/source/i18n/coll.cpp
index fe73118d..7bdd80f3 100644
--- a/source/i18n/coll.cpp
+++ b/source/i18n/coll.cpp
@@ -372,7 +372,7 @@ void setAttributesFromKeywords(const Locale &loc, Collator &coll, UErrorCode &er
         return;
     }
     if (length != 0) {
-        int32_t codes[USCRIPT_CODE_LIMIT + UCOL_REORDER_CODE_LIMIT - UCOL_REORDER_CODE_FIRST];
+        int32_t codes[USCRIPT_CODE_LIMIT + (UCOL_REORDER_CODE_LIMIT - UCOL_REORDER_CODE_FIRST)];
         int32_t codesLength = 0;
         char *scriptName = value;
         for (;;) {
diff --git a/source/i18n/collationdata.h b/source/i18n/collationdata.h
index ab9b4c47..71bf17ab 100644
--- a/source/i18n/collationdata.h
+++ b/source/i18n/collationdata.h
@@ -41,16 +41,12 @@ struct U_I18N_API CollationData : public UMemory {
     // Note: The ucadata.icu loader could discover the reserved ranges by setting an array
     // parallel with the ranges, and resetting ranges that are indexed.
     // The reordering builder code could clone the resulting template array.
-    enum {
-        REORDER_RESERVED_BEFORE_LATIN = UCOL_REORDER_CODE_FIRST + 14,
-        REORDER_RESERVED_AFTER_LATIN
-    };
-
-    enum {
-        MAX_NUM_SPECIAL_REORDER_CODES = 8,
-        /** C++ only, data reader check scriptStartsLength. */
-        MAX_NUM_SCRIPT_RANGES = 256
-    };
+    static constexpr int32_t REORDER_RESERVED_BEFORE_LATIN = UCOL_REORDER_CODE_FIRST + 14;
+    static constexpr int32_t REORDER_RESERVED_AFTER_LATIN = REORDER_RESERVED_BEFORE_LATIN + 1;
+
+    static constexpr int32_t MAX_NUM_SPECIAL_REORDER_CODES = 8;
+    /** C++ only, data reader check scriptStartsLength. */
+    static constexpr int32_t MAX_NUM_SCRIPT_RANGES = 256;
 
     CollationData(const Normalizer2Impl &nfc)
             : trie(NULL),
diff --git a/source/i18n/collationdatareader.cpp b/source/i18n/collationdatareader.cpp
index 0eb18613..c7ab04cd 100644
--- a/source/i18n/collationdatareader.cpp
+++ b/source/i18n/collationdatareader.cpp
@@ -436,7 +436,7 @@ CollationDataReader::read(const CollationTailoring *base, const uint8_t *inBytes
     settings->options = options;
     // Set variableTop from options and scripts data.
     settings->variableTop = tailoring.data->getLastPrimaryForGroup(
-            UCOL_REORDER_CODE_FIRST + settings->getMaxVariable());
+            UCOL_REORDER_CODE_FIRST + int32_t{settings->getMaxVariable()});
     if(settings->variableTop == 0) {
         errorCode = U_INVALID_FORMAT_ERROR;
         return;
diff --git a/source/i18n/formatted_string_builder.h b/source/i18n/formatted_string_builder.h
index 92bcf07d..32e0900a 100644
--- a/source/i18n/formatted_string_builder.h
+++ b/source/i18n/formatted_string_builder.h
@@ -218,7 +218,9 @@ class U_I18N_API FormattedStringBuilder : public UMemory {
 };
 
 static_assert(
-    std::is_pod<FormattedStringBuilder::Field>::value,
+    // std::is_pod<> is deprecated.
+    std::is_standard_layout<FormattedStringBuilder::Field>::value &&
+        std::is_trivial<FormattedStringBuilder::Field>::value,
     "Field should be a POD type for efficient initialization");
 
 constexpr FormattedStringBuilder::Field::Field(uint8_t category, uint8_t field)
diff --git a/source/i18n/gregoimp.cpp b/source/i18n/gregoimp.cpp
index 537aa19d..101a8b8b 100644
--- a/source/i18n/gregoimp.cpp
+++ b/source/i18n/gregoimp.cpp
@@ -144,7 +144,7 @@ void Grego::timeToFields(UDate time, int32_t& year, int32_t& month,
 
 int32_t Grego::dayOfWeek(double day) {
     int32_t dow;
-    ClockMath::floorDivide(day + UCAL_THURSDAY, 7, dow);
+    ClockMath::floorDivide(day + int{UCAL_THURSDAY}, 7, dow);
     return (dow == 0) ? UCAL_SATURDAY : dow;
 }
 
diff --git a/source/i18n/rulebasedcollator.cpp b/source/i18n/rulebasedcollator.cpp
index 5e5cc3db..5f771468 100644
--- a/source/i18n/rulebasedcollator.cpp
+++ b/source/i18n/rulebasedcollator.cpp
@@ -538,7 +538,8 @@ RuleBasedCollator::setMaxVariable(UColReorderCode group, UErrorCode &errorCode)
     }
 
     if(group == UCOL_REORDER_CODE_DEFAULT) {
-        group = (UColReorderCode)(UCOL_REORDER_CODE_FIRST + defaultSettings.getMaxVariable());
+        group = (UColReorderCode)(
+            UCOL_REORDER_CODE_FIRST + int32_t{defaultSettings.getMaxVariable()});
     }
     uint32_t varTop = data->getLastPrimaryForGroup(group);
     U_ASSERT(varTop != 0);
@@ -556,7 +557,7 @@ RuleBasedCollator::setMaxVariable(UColReorderCode group, UErrorCode &errorCode)
 
 UColReorderCode
 RuleBasedCollator::getMaxVariable() const {
-    return (UColReorderCode)(UCOL_REORDER_CODE_FIRST + settings->getMaxVariable());
+    return (UColReorderCode)(UCOL_REORDER_CODE_FIRST + int32_t{settings->getMaxVariable()});
 }
 
 uint32_t
diff --git a/source/i18n/unicode/basictz.h b/source/i18n/unicode/basictz.h
index d9f85e45..a1c94e52 100644
--- a/source/i18n/unicode/basictz.h
+++ b/source/i18n/unicode/basictz.h
@@ -186,13 +186,15 @@ protected:
 
 #ifndef U_HIDE_INTERNAL_API
     /**
-     * The time type option bit masks used by getOffsetFromLocal
+     * A time type option bit mask used by getOffsetFromLocal.
      * @internal
      */
-    enum {
-        kStdDstMask = kDaylight,
-        kFormerLatterMask = kLatter
-    };
+    static constexpr int32_t kStdDstMask = kDaylight;
+    /**
+     * A time type option bit mask used by getOffsetFromLocal.
+     * @internal
+     */
+    static constexpr int32_t kFormerLatterMask = kLatter;
 #endif  /* U_HIDE_INTERNAL_API */
 
     /**
diff --git a/source/i18n/unicode/calendar.h b/source/i18n/unicode/calendar.h
index c1bdf928..ddffc7b9 100644
--- a/source/i18n/unicode/calendar.h
+++ b/source/i18n/unicode/calendar.h
@@ -1766,16 +1766,22 @@ protected:
     int32_t newestStamp(UCalendarDateFields start, UCalendarDateFields end, int32_t bestSoFar) const;
 
     /**
-     * Values for field resolution tables
+     * Marker for end of resolve set (row or group). Value for field resolution tables.
+     *
      * @see #resolveFields
      * @internal
      */
-    enum {
-      /** Marker for end of resolve set (row or group). */
-      kResolveSTOP = -1,
-      /** Value to be bitwised "ORed" against resolve table field values for remapping.  Example: (UCAL_DATE | kResolveRemap) in 1st column will cause 'UCAL_DATE' to be returned, but will not examine the value of UCAL_DATE.  */
-      kResolveRemap = 32
-    };
+    static constexpr int32_t kResolveSTOP = -1;
+    /**
+     * Value to be bitwised "ORed" against resolve table field values for remapping.
+     * Example: (UCAL_DATE | kResolveRemap) in 1st column will cause 'UCAL_DATE' to be returned,
+     * but will not examine the value of UCAL_DATE.
+     * Value for field resolution tables.
+     *
+     * @see #resolveFields
+     * @internal
+     */
+    static constexpr int32_t kResolveRemap = 32;
 
     /**
      * Precedence table for Dates
diff --git a/source/test/cintltst/ucptrietest.c b/source/test/cintltst/ucptrietest.c
index af578f7a..8b8e0fb5 100644
--- a/source/test/cintltst/ucptrietest.c
+++ b/source/test/cintltst/ucptrietest.c
@@ -12,7 +12,6 @@
 #include "unicode/utf16.h"
 #include "unicode/utf8.h"
 #include "uassert.h"
-#include "ucptrie_impl.h"
 #include "utrie.h"
 #include "cstring.h"
 #include "cmemory.h"
diff --git a/source/test/intltest/numrgts.cpp b/source/test/intltest/numrgts.cpp
index c8d278e2..b7b89158 100644
--- a/source/test/intltest/numrgts.cpp
+++ b/source/test/intltest/numrgts.cpp
@@ -1474,7 +1474,7 @@ void NumberFormatRegressionTest::Test4106658(void)
 #if U_PLATFORM == U_PF_HPUX
     d1 = 0.0 * -1.0;    // old HPUX compiler ignores volatile keyword
 #else
-    d1 *= -1.0; // Some compilers have a problem with defining -0.0
+    d1 = d1 * -1.0; // Some compilers have a problem with defining -0.0
 #endif
     logln("pattern: \"" + df->toPattern(temp) + "\"");
     df->format(d1, buffer, pos);
@@ -1605,7 +1605,7 @@ void NumberFormatRegressionTest::Test4106667(void)
 #if U_PLATFORM == U_PF_HPUX
     d = 0.0 * -1.0;    // old HPUX compiler ignores volatile keyword
 #else
-    d *= -1.0; // Some compilers have a problem with defining -0.0
+    d = d * -1.0; // Some compilers have a problem with defining -0.0
 #endif
     df->setPositivePrefix(/*"+"*/bar);
     df->format(d, buffer, pos);
@@ -2056,7 +2056,7 @@ void NumberFormatRegressionTest::Test4147706(void)
 #if U_PLATFORM == U_PF_HPUX
         d1 = 0.0 * -1.0;    // old HPUX compiler ignores volatile keyword
 #else
-        d1 *= -1.0; // Some compilers have a problem with defining -0.0
+        d1 = d1 * -1.0; // Some compilers have a problem with defining -0.0
 #endif
         df->adoptDecimalFormatSymbols(syms);
         f1 = df->format(d1, f1, pos);
diff --git a/source/test/intltest/tsdate.cpp b/source/test/intltest/tsdate.cpp
index 79e61e82..6f81f623 100644
--- a/source/test/intltest/tsdate.cpp
+++ b/source/test/intltest/tsdate.cpp
@@ -19,8 +19,6 @@
 #include <stdlib.h>
 #include <math.h>
 
-const double IntlTestDateFormat::ONEYEAR = 365.25 * ONEDAY; // Approximate
-
 IntlTestDateFormat::~IntlTestDateFormat() {}
 
 /**
diff --git a/source/test/intltest/tsdate.h b/source/test/intltest/tsdate.h
index 95b8dd69..350d1cd9 100644
--- a/source/test/intltest/tsdate.h
+++ b/source/test/intltest/tsdate.h
@@ -59,15 +59,13 @@ private:
     UnicodeString fTestName;
     int32_t fLimit; // How many iterations it should take to reach convergence
 
-    enum
-    {
-        // Values in milliseconds (== Date)
-        ONESECOND = 1000,
-        ONEMINUTE = 60 * ONESECOND,
-        ONEHOUR = 60 * ONEMINUTE,
-        ONEDAY = 24 * ONEHOUR
-    };
-    static const double ONEYEAR;
+    // Values in milliseconds (== Date)
+    static constexpr int32_t ONESECOND = 1000;
+    static constexpr int32_t ONEMINUTE = 60 * ONESECOND;
+    static constexpr int32_t ONEHOUR = 60 * ONEMINUTE;
+    static constexpr int32_t ONEDAY = 24 * ONEHOUR;
+
+    static constexpr double ONEYEAR = 365.25 * ONEDAY; // Approximate
     enum EMode
     {
         GENERIC,
diff --git a/source/test/intltest/tsputil.cpp b/source/test/intltest/tsputil.cpp
index 8a169ca8..a59d37bc 100644
--- a/source/test/intltest/tsputil.cpp
+++ b/source/test/intltest/tsputil.cpp
@@ -324,7 +324,7 @@ PUtilTest::testZero(void)
     volatile double pzero   = 0.0;
     volatile double nzero   = 0.0;
 
-    nzero *= -1;
+    nzero = nzero * -1;
 
     if((pzero == nzero) != TRUE) {
         errln("FAIL: 0.0 == -0.0 returned FALSE, should be TRUE.");