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An automated rewrite will add concrete type assertions after
a test of n.Op(), when n can be safely type-asserted
(meaning, n is not reassigned a different type, n is not reassigned
and then used outside the scope of the type assertion,
and so on).
This sequence of CLs handles the code that the automated
rewrite does not: adding specific types to function arguments,
adjusting code not to call n.Left() etc when n may have multiple
representations, and so on.
This CL focuses on noder.go.
Passes buildall w/ toolstash -cmp.
Change-Id: Ie870126b51558e83c738add8e91a2804ed6d7f92
Reviewed-on: https://go-review.googlesource.com/c/go/+/277931
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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