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doc: Don't imply incorrect guarantees about data races.
A race between a = "hello, world" and print(a) is not guaranteed to print either "hello, world" or "". Its behaviour is undefined. Fixes #4039. R=rsc CC=dvyukov, gobot, golang-dev, r https://golang.org/cl/6489075
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@ -270,8 +270,8 @@ before the <code>print</code>.
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<p>
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If the channel were buffered (e.g., <code>c = make(chan int, 1)</code>)
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then the program would not be guaranteed to print
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<code>"hello, world"</code>. (It might print the empty string;
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it cannot print <code>"goodbye, universe"</code>, nor can it crash.)
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<code>"hello, world"</code>. (It might print the empty string,
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crash, or do something else.)
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</p>
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<h3>Locks</h3>
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