gcc 10就支持了，不是10.3才支持

【 在 dkutou (dkutou) 的大作中提到: 】
: https://gcc.gnu.org/gcc-10/changes.html
: Extended characters in identifiers may now be specified directly in the input encoding (UTF-8, by default),
: in addition to the UCN syntax (\uNNNN or \UNNNNNNNN) that is already supported:
: ...................
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