Thanks. 
Keep using an object that was passed to Pool.Put, you may have a data race 
to write and read that object.
I think the data race is not as critical as dangling pointers.At least a 
program with data race is difficult to predict, dangling pointers may be 
used to run arbitrary code.

So the compiler auto mark some memory free can be use again can be worked 
as safe and fast language.

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