We'd like to call canExtractVariable in extractVariable without
duplicating logic. The same needs to be done for canExtractFunction.
Change-Id: Ia99befabbafffcf13dd3bc12355f9ddb81a71002
Reviewed-on: https://go-review.googlesource.com/c/tools/+/245135
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Josh Baum <joshbaum@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>