std.Io.Threaded: Raise specific error when DNS lookup returns no A/AAAA records
#25970
+3
−2
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This is an immediate fix for #25948.
Whenever a particular hostname + suffix fails to resolve,
lookupDnsSearchwill continue on to the next search domain.A new error is added in order to avoid squashing
NameServerFailurewhich indicates a network/server error.