Playground said response was not JSON

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Rust playground said

Response was not JSON: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
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The Playground is currently broken, it has been for around a day at least. Most of the time it doesn't compile the code, and I was unable to share links. You can file an issue, but I'm pretty sure the maintainers have been made aware of the problem by now.

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If you are looking for alternatives, two possible ones you could use (depending on your usecase) are the Compiler Explorer (multi-language, mainly focused on assembly and optimization) and rustexplorer.com (Rust only, similar to the Playground, but missing some features).

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