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Nicholas Shahan e8cd9f0c44 [ddc] Refactor _isInterfaceSubtype
Move the method body out of one giant JS foreign function and into
Dart code with small JS foreign function calls inside.

* Removes the confusion around what it actually means when we use
  Dart String interpolation within the JS function template.
* Highlights the operations that actually need the JS foreign
  function.
* Allows for syntax highlighting and automatic formatting of this
  code.
* Allows for IDE "jump to definition" for class members that were
  previously inside the template.

These changes were developed by diffing the compiled output to
ensure the changes were as minimal and inconsequential as possible.
Intentional diffs include:
* Add a required message argument to `dart.assertFailed()`.
* Add local variables for `varianceType`, `typeArg1`, and
  `typeArg2`.

The only other diff was the loop variable incrementing:
`++i` -> `i = i + 1`

Change-Id: I76a1522fa4950f05748f905e1aec32c8b7dd4670
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213526
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Srujan Gaddam <srujzs@google.com>
2021-09-20 23:06:55 +00:00
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Dart

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