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Weird async/await error message around mutablility #51932
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A-async-awaitArea: Async & AwaitArea: Async & AwaitA-borrow-checkerArea: The borrow checkerArea: The borrow checkerA-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsAsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
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A-async-awaitArea: Async & AwaitArea: Async & AwaitA-borrow-checkerArea: The borrow checkerArea: The borrow checkerA-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lintsAsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
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Attempting to mutate an argument to an
async fnthat was not markedmutresults in this error message:cannot borrow immutable captured outer variable in an `FnOnce` closure `sender` as mutableThis is obviously subpar 😆