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[Roll-forward of CL 436915 by Tobias Klauser, with builtin and gen
directories dropped now that they've been handled separately.]

The minimum bootstrap version for Go ≥ 1.20 is Go 1.17. That version
supports the new style //go:build lines. Thus the old style //+build
lines can be dropped in this part of the tree as well. Leave the
//+build lines in cmd/dist which will ensure the minimum Go version
during bootstrap.

As suggested by Cherry during review of CL 430496

For #44505

Change-Id: Ifa686656c3e50bf7f92f70747b44d74a7d51bad8
Reviewed-by: Cherry Mui <>
TryBot-Result: Gopher Robot <>
Run-TryBot: Russ Cox <>


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The Go Programming Language

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