66e2b22d14
Fixes https://github.com/dart-lang/sdk/issues/42216 Report when an extension declares a type parameter with the same name as the extension. Report when an extension declares a member with the same basename as the name of any of the extension's type parameters. Move tests into diagnostics/. Move tests for RECURSIVE_INTERFANCE_INHERITANCE. Change-Id: If19041571008b9b14122d9ff458d1d30ea0ff034 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150270 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>