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Fail gracefully if mutating on a use closure and the closure it not declared mut

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Santiago Pastorino 2025-02-14 18:42:06 -03:00
parent 6eb6ff62f7
commit aa58439f87
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3 changed files with 28 additions and 1 deletions
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2
compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
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@ -823,7 +823,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
) => {
capture_reason = format!("mutable borrow of `{upvar}`");
}
ty::UpvarCapture::ByValue => {
ty::UpvarCapture::ByValue | ty::UpvarCapture::ByUse => {
capture_reason = format!("possible mutation of `{upvar}`");
}
_ => bug!("upvar `{upvar}` borrowed, but not mutably"),