394dd8d792
Fixes a warning in generated Swift output when an argument is of type Object. This is blocking flutter/plugins#6914 since we check our macOS and iOS plugin code for warnings in CI. Rather than add a Dart generator unit test for this one specific case, I tightened the Swift compilation settings for our test plugin to treat warnings as errors (per flutter/flutter#59116 (comment)) to catch the entire class of errors, and added echo* variants for Object to make sure this one then showed up. Incidental fixes: I had to make a similar fix to the Dart generator for a similar warning with casting to Object?, which we'd never noticed because we weren't analyzing any generated code that returning Object or Object? before. I had to make a change to the C++ generator so that generation would succeed, because it turned out we had no handling at all of Object in the C++ generator, causing it to throw. I'm not sure this is the output I'll keep for C++ (thus the TODO), but it's the simple fix to make it work at all. Fixes flutter/flutter#117994 Part of flutter/flutter#59116
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