bjoernager/rust
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Enforce diverging let...else

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This commit is contained in:
Cameron Steffen 2021-07-30 11:30:12 -05:00
parent cb4439a315
commit 2f4e86b9ef
4 changed files with 33 additions and 5 deletions
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5
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -781,6 +781,10 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
);
}
}
ObligationCauseCode::LetElse => {
err.help("try adding a diverging expression, such as `return` or `panic!(..)`");
err.help("...or use `match` instead of `let...else`");
}
_ => (),
}
}
@ -2592,6 +2596,7 @@ impl<'tcx> ObligationCauseExt<'tcx> for ObligationCause<'tcx> {
}
IfExpression { .. } => Error0308("`if` and `else` have incompatible types"),
IfExpressionWithNoElse => Error0317("`if` may be missing an `else` clause"),
LetElse => Error0308("`else` clause of `let...else` does not diverge"),
MainFunctionType => Error0580("`main` function has wrong type"),
StartFunctionType => Error0308("`#[start]` function has wrong type"),
IntrinsicType => Error0308("intrinsic has wrong type"),