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A Dart language and library conformance test suite

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While debugging https://github.com/dart-lang/sdk/issues/54140 @mkustermann realized that some of the async tests in co19 are missing `asyncStart` and `asyncEnd`: - https://github.com/dart-lang/co19/blob/master/Language/Functions/element_type_A02_t03.dart - https://github.com/dart-lang/co19/blob/master/Language/Functions/element_type_A02_t04.dart - https://github.com/dart-lang/co19/blob/master/Language/Functions/element_type_A02_t06.dart When testing in the browser, without...

bad-test

We have no tests tor the following statement > It is a compile-time error if a parameterized type T is super-bounded when > it is used in any of the...

type-enhancement

We have co19 tests checking what should happen if we call `create/createSync()` and `FileSystemEntity` of the same type exists. But we have no tests checking what will happen when, say,...

type-enhancement

This is the [relevant code](https://github.com/dart-lang/co19/blob/dcc3cbe37ae5aa0212987d2038d70fba7139a3ed/LibTest/io/Link/create_A04_t04.dart#L46). I've updated the docs in [this PR](https://dart-review.googlesource.com/c/sdk/+/328661/3/sdk/lib/io/link.dart). I think that this test can just be deleted.

bad-test

Placeholder issue for minor co19 improvements (code formatting, assertion/description wording fixes, adding issue numbers etc)

type-code-health
type-documentation

For the statement > Let C be a class. It is a compile-time error if C declares a constructor C named C.n and a static member with basename n we...

type-enhancement

Variables and Local Variable declaration sections of the [specification](https://spec.dart.dev/DartLangSpecDraft.pdf) were updated. See https://github.com/dart-lang/language/commit/af27cfbcc99c4af22c6e71bb84cdb5addbb826a0. Need to update co19 tests accordingly

type-enhancement

Add more tests for `9. Functions`

type-enhancement

https://api.dart.dev/dev/2.12.0-279.0.dev/dart-ffi/dart-ffi-library.html

type-enhancement