test_identifierTypesFromSpecialIdentifier() fails on Darwin #333
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This is caused by ICU's update: rdar://114361374.
Introduce FIXED_ICU_20187 to indicate the ICU version with the fix and update test expectation behind the flag. The upstream change unicode-org/icu@1afef30 is scheduled to go into ICU 74. Darwin ICU picked this up earlier than their annual ICU update. When we update FoundationICU to ICU74 we should remove this flag and enable the desired behavior everywhere.
Resolves rdar://118564689