io: drop the Sized
requirements from AsyncReadExt.read_buf
#6169
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Motivation
AsyncReadExt.read_buf
takes bothSelf
and its buffer argument by mut ref, yet requiresSized
for both of them,disallowing
dyn Trait
for no good reason.Solution
Remove the explicit
Sized
requirement forSelf
, and introduce?Sized
in relevant places.See also #6161