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Fixes #38815

In #38107 to skip global function refactoring (when arrow function uses this, extract-method38.ts, extract-method39.ts), I added checking arrow function, to find this usage., It caused that during checking arrow function body, service finds return and marks as used too. I changed that, to find only this in arrow function, and skip dive into further checking. If there is a much better way to do that, I would be grateful if you could please point me out about it.

cc @andrewbranch

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Thanks @a-tarasyuk! This approach makes sense to me.

@andrewbranch andrewbranch added the For Milestone Bug PRs that fix a bug with a specific milestone label Jun 1, 2020
@andrewbranch andrewbranch merged commit 68d2ee0 into microsoft:master Jun 1, 2020
cangSDARM added a commit to cangSDARM/TypeScript that referenced this pull request Jun 2, 2020
* upstream/master: (78 commits)
  LEGO: check in for master to temporary branch.
  Skip default when initially iterating exports in __importStar, same as __exportStar (microsoft#38808)
  fix line endings
  Improve error range for ts2657 (jsx expr must have parent element), add code fix for it (microsoft#37917)
  fix(32341): add prefix name for module exports properties (microsoft#38541)
  fix(19385): add space after brace in the multiline string template (microsoft#38742)
  fix(38815): dive in arrow functions to check only this usage instead of checking all statements (microsoft#38865)
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  Convert HTML tags in doc-comments into markdown
  fix linting error
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  fix(38722): change error message for use-before-declaration on const enum (microsoft#38728)
  ...
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Extract to function crash

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