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Sam Xie 230bdd10f0
Add SpanContextFromContext() (#1255)
* SpanFromContext returns nil if span not exists

* Add tests for SpanContextFromContext

* Update CHANGELOG

* Update trace.go

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

* SpanFromContext() continue to return a noopSpan{}

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
2020-10-21 17:30:28 -04:00
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