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Better error messages when mixing io::Result and non io::Result #62125

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Better error messages when mixing io::Result and non io::Result#62125
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A-diagnosticsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
@xavierd

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@xavierd
xavierd
opened on Jun 25, 2019

See the following playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=98bf237ffb9961d9d598c4ed16194517

A better error message can suggest writing the nested function as: Ok(bar()?)

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    A-diagnosticsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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