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template: warn about interleaved nature of writes
Execute incurs separate writes for each "step", e.g. each variable that needs to be printed, and the final newline. While it is correct to state that templates can be executed concurrently, there is a more subtle nuance that is easily missed: when writing to the same writer, the writes from concurrent execute calls can be interleaved, leading to unexpected output. Change-Id: I0abbd7960d8a8d15e109a8a3eeff3b43b852bbbf Reviewed-on: https://go-review.googlesource.com/37444 Reviewed-by: Rob Pike <r@golang.org>
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