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More fine-grained delineation for mir-borrowck errors.

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This commit is contained in:
Felix S. Klock II 2017-08-22 11:23:17 +02:00
parent cd93969ec4
commit c4c32b24bd
1 changed files with 20 additions and 4 deletions
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24
src/librustc_mir/borrow_check.rs
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@ -948,14 +948,30 @@ impl<'c, 'b, 'a: 'b+'c, 'gcx, 'tcx: 'a> MirBorrowckCtxt<'c, 'b, 'a, 'gcx, 'tcx>
let mut err = match (loan1.kind, "immutable", "mutable",
loan2.kind, "immutable", "mutable") {
(BorrowKind::Shared, lft, _, BorrowKind::Mut, _, rgt) |
(BorrowKind::Mut, _, lft, BorrowKind::Shared, rgt, _) |
(BorrowKind::Mut, _, lft, BorrowKind::Mut, _, rgt) =>
(BorrowKind::Mut, _, lft, BorrowKind::Shared, rgt, _) =>
self.tcx.cannot_reborrow_already_borrowed(
span, &self.describe_lvalue(lvalue),
"", lft, "it", rgt, "", Origin::Mir),
_ => self.tcx.cannot_mutably_borrow_multiply(
span, &self.describe_lvalue(lvalue), "", Origin::Mir),
(BorrowKind::Mut, _, _, BorrowKind::Mut, _, _) =>
self.tcx.cannot_mutably_borrow_multiply(
span, &self.describe_lvalue(lvalue), "", Origin::Mir),
(BorrowKind::Unique, _, _, BorrowKind::Unique, _, _) =>
self.tcx.cannot_uniquely_borrow_by_two_closures(
span, &self.describe_lvalue(lvalue), Origin::Mir),
(BorrowKind::Unique, _, _, _, _, _) =>
self.tcx.cannot_uniquely_borrow_by_one_closure(
span, &self.describe_lvalue(lvalue), "it", "", Origin::Mir),
(_, _, _, BorrowKind::Unique, _, _) =>
self.tcx.cannot_reborrow_already_uniquely_borrowed(
span, &self.describe_lvalue(lvalue), "it", "", Origin::Mir),
(BorrowKind::Shared, _, _, BorrowKind::Shared, _, _) =>
unreachable!(),
// FIXME: add span labels for first and second mutable borrows, as well as
// end point for first.
};