client: make RequestBuilder Send when building async #2734
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Solana’s Signer trait has neither Send nor Sync bound. Lack of those
bonds trickles down to RequestBuilder type which contains a
signers: Vec<&dyn Signer>
field.Introduce a new
nonblocking::Signer
trait which addsSend
boundand is automatically implemented on any type which implement’s
Solana’s
Signer
trait and isSend
. As this is added tononblocking
module, it’s only used when usingasync
feature.With that present, use it in RequestBuilder struct making it
Send
.