reflect: add parentheses to properly bind <- in ChanOf’s string

Adds parentheses so as to properly bind <- to the right most
channel.
This meant that previously given:

   ChanOf(<-chan T)

it would mistakenly try to look up the type as

    chan <-chan T

instead of

    chan (<-chan T)

Fixes #39897

Change-Id: I8564916055f5fadde3382e41fe8820a1071e5f13
GitHub-Last-Rev: f8f2abe8d4c9e3d1414c89cadca8a16ce5cdeab9
GitHub-Pull-Request: golang/go#39898
Reviewed-on: https://go-review.googlesource.com/c/go/+/240280
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: 689bdd791549777cabb431eb27d52fc3848e9fe1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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