[Augmentations] No error in the analyzer if augmentation declares a different return type

[sgrekhov]

/==================================================================================================================================\
| co19/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01 is new and failed (MissingCompileTimeError, expected Pass) |
\==================================================================================================================================/

--- Command "dart2analyzer" (took 40ms):
DART_CONFIGURATION=ReleaseX64 out/ReleaseX64/dart-sdk/bin/dart out/ReleaseX64/gen/dartanalyzer.dart.snapshot -Dtest_runner.configuration=analyzer-asserts-linux --enable-experiment=macros --ignore-unrecognized-flags --packages=/b/s/w/ir/cache/builder/sdk/.dart_tool/package_config.json --format=json /b/s/w/ir/cache/builder/sdk/tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01.dart

static error failures:
- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 25, column 9, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 29, column 9, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 35, column 18, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 39, column 18, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 43, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 47, column 11, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 54, column 18, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 58, column 18, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 62, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 66, column 11, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 74, column 18, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 78, column 18, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 82, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 86, column 11, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 93, column 18, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 97, column 18, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 101, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 105, column 11, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 112, column 18, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 116, column 18, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 120, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 124, column 11, length 6.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 128, column 11, length 3.

- Missing expected unspecified error at tests/co19/src/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01_lib.dart line 132, column 11, length 6.

--- Re-run this test:
python3 tools/test.py -n analyzer-asserts-linux co19/LanguageFeatures/Augmentation-libraries/type_inheritance_A02_t01

[sgrekhov]

Also variable type.
https://github.com/dart-lang/co19/blob/master/LanguageFeatures/Augmentation-libraries/type_inheritance_A03_t01_lib.dart

[sgrekhov]

Also type bounds
https://github.com/dart-lang/co19/blob/master/LanguageFeatures/Augmentation-libraries/type_inheritance_A05_t01.dart