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Auto merge of #51638 - spastorino:diagnostic-suggest-drop-in-reverse, r=nikomatsakis

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Diagnostic suggest drop in reverse

Closes #51195
This commit is contained in:
bors 2018-06-20 09:30:02 +00:00
commit 7d313eaeb6
22 changed files with 784 additions and 454 deletions
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961
src/librustc/mir/mod.rs
View File

File diff suppressed because it is too large Load Diff

98
src/librustc_mir/borrow_check/error_reporting.rs
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@ -8,20 +8,21 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use syntax_pos::Span;
use borrow_check::WriteKind;
use rustc::middle::region::ScopeTree;
use rustc::mir::{BorrowKind, Field, Local, LocalKind, Location, Operand};
use rustc::mir::{Place, ProjectionElem, Rvalue, Statement, StatementKind};
use rustc::ty::{self, RegionKind};
use rustc_data_structures::indexed_vec::Idx;
use rustc_data_structures::sync::Lrc;
use syntax_pos::Span;
use super::borrow_set::BorrowData;
use super::{Context, MirBorrowckCtxt};
use super::{InitializationRequiringAction, PrefixSet};
use super::borrow_set::BorrowData;
use dataflow::{FlowAtLocation, MovingOutStatements};
use dataflow::move_paths::MovePathIndex;
use dataflow::{FlowAtLocation, MovingOutStatements};
use util::borrowck_errors::{BorrowckErrors, Origin};
impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
@ -39,13 +40,9 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
.collect::<Vec<_>>();
if mois.is_empty() {
let root_place = self.prefixes(&place, PrefixSet::All)
.last()
.unwrap();
let root_place = self.prefixes(&place, PrefixSet::All).last().unwrap();
if self.moved_error_reported
.contains(&root_place.clone())
{
if self.moved_error_reported.contains(&root_place.clone()) {
debug!(
"report_use_of_moved_or_uninitialized place: error about {:?} suppressed",
root_place
@ -53,8 +50,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
return;
}
self.moved_error_reported
.insert(root_place.clone());
self.moved_error_reported.insert(root_place.clone());
let item_msg = match self.describe_place(place) {
Some(name) => format!("`{}`", name),
@ -162,7 +158,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
format!("borrow of {} occurs here", borrow_msg),
);
err.span_label(span, format!("move out of {} occurs here", value_msg));
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, None, &mut err);
err.emit();
}
@ -177,12 +173,13 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
span,
&self.describe_place(place).unwrap_or("_".to_owned()),
self.retrieve_borrow_span(borrow),
&self.describe_place(&borrow.borrowed_place)
&self
.describe_place(&borrow.borrowed_place)
.unwrap_or("_".to_owned()),
Origin::Mir,
);
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, None, &mut err);
err.emit();
}
@ -286,8 +283,8 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"mutable",
) {
(BorrowKind::Shared, lft, _, BorrowKind::Mut { .. }, _, rgt)
| (BorrowKind::Mut { .. }, _, lft, BorrowKind::Shared, rgt, _) => {
tcx.cannot_reborrow_already_borrowed(
| (BorrowKind::Mut { .. }, _, lft, BorrowKind::Shared, rgt, _) => tcx
.cannot_reborrow_already_borrowed(
span,
&desc_place,
"",
@ -298,11 +295,10 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"",
None,
Origin::Mir,
)
}
),
(BorrowKind::Mut { .. }, _, _, BorrowKind::Mut { .. }, _, _) => {
tcx.cannot_mutably_borrow_multiply(
(BorrowKind::Mut { .. }, _, _, BorrowKind::Mut { .. }, _, _) => tcx
.cannot_mutably_borrow_multiply(
span,
&desc_place,
"",
@ -310,18 +306,16 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"",
None,
Origin::Mir,
)
}
),
(BorrowKind::Unique, _, _, BorrowKind::Unique, _, _) => {
tcx.cannot_uniquely_borrow_by_two_closures(
(BorrowKind::Unique, _, _, BorrowKind::Unique, _, _) => tcx
.cannot_uniquely_borrow_by_two_closures(
span,
&desc_place,
issued_span,
None,
Origin::Mir,
)
}
),
(BorrowKind::Unique, _, _, _, _, _) => tcx.cannot_uniquely_borrow_by_one_closure(
span,
@ -334,8 +328,8 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
Origin::Mir,
),
(BorrowKind::Shared, lft, _, BorrowKind::Unique, _, _) => {
tcx.cannot_reborrow_already_uniquely_borrowed(
(BorrowKind::Shared, lft, _, BorrowKind::Unique, _, _) => tcx
.cannot_reborrow_already_uniquely_borrowed(
span,
&desc_place,
"",
@ -344,11 +338,10 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"",
None,
Origin::Mir,
)
}
),
(BorrowKind::Mut { .. }, _, lft, BorrowKind::Unique, _, _) => {
tcx.cannot_reborrow_already_uniquely_borrowed(
(BorrowKind::Mut { .. }, _, lft, BorrowKind::Unique, _, _) => tcx
.cannot_reborrow_already_uniquely_borrowed(
span,
&desc_place,
"",
@ -357,8 +350,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"",
None,
Origin::Mir,
)
}
),
(BorrowKind::Shared, _, _, BorrowKind::Shared, _, _) => unreachable!(),
};
@ -380,7 +372,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
);
}
self.explain_why_borrow_contains_point(context, issued_borrow, &mut err);
self.explain_why_borrow_contains_point(context, issued_borrow, None, &mut err);
err.emit();
}
@ -389,10 +381,13 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
&mut self,
context: Context,
borrow: &BorrowData<'tcx>,
drop_span: Span,
place_span: (&Place<'tcx>, Span),
kind: Option<WriteKind>,
) {
let drop_span = place_span.1;
let scope_tree = self.tcx.region_scope_tree(self.mir_def_id);
let root_place = self.prefixes(&borrow.borrowed_place, PrefixSet::All)
let root_place = self
.prefixes(&borrow.borrowed_place, PrefixSet::All)
.last()
.unwrap();
@ -402,7 +397,8 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
_ => drop_span,
};
if self.access_place_error_reported
if self
.access_place_error_reported
.contains(&(root_place.clone(), borrow_span))
{
debug!(
@ -450,6 +446,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
drop_span,
borrow_span,
proper_span,
kind.map(|k| (k, place_span.0)),
);
}
(RegionKind::ReEarlyBound(_), None)
@ -471,8 +468,11 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
| (RegionKind::ReClosureBound(_), _)
| (RegionKind::ReCanonical(_), _)
| (RegionKind::ReErased, _) => {
span_bug!(drop_span, "region {:?} does not make sense in this context",
borrow.region);
span_bug!(
drop_span,
"region {:?} does not make sense in this context",
borrow.region
);
}
}
}
@ -495,7 +495,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
drop_span,
format!("`{}` dropped here while still borrowed", name),
);
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, None, &mut err);
err.emit();
}
@ -517,7 +517,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
"temporary value dropped here while still borrowed",
);
err.note("consider using a `let` binding to increase its lifetime");
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, None, &mut err);
err.emit();
}
@ -530,6 +530,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
drop_span: Span,
borrow_span: Span,
_proper_span: Span,
kind_place: Option<(WriteKind, &Place<'tcx>)>,
) {
debug!(
"report_unscoped_local_value_does_not_live_long_enough(\
@ -544,7 +545,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
err.span_label(borrow_span, "borrowed value does not live long enough");
err.span_label(drop_span, "borrowed value only lives until here");
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, kind_place, &mut err);
err.emit();
}
@ -570,7 +571,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
err.span_label(proper_span, "temporary value does not live long enough");
err.span_label(drop_span, "temporary value only lives until here");
self.explain_why_borrow_contains_point(context, borrow, &mut err);
self.explain_why_borrow_contains_point(context, borrow, None, &mut err);
err.emit();
}
@ -588,7 +589,7 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
Origin::Mir,
);
self.explain_why_borrow_contains_point(context, loan, &mut err);
self.explain_why_borrow_contains_point(context, loan, None, &mut err);
err.emit();
}
@ -759,9 +760,10 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
Place::Static(ref static_) => self.describe_field_from_ty(&static_.ty, field),
Place::Projection(ref proj) => match proj.elem {
ProjectionElem::Deref => self.describe_field(&proj.base, field),
ProjectionElem::Downcast(def, variant_index) => {
format!("{}", def.variants[variant_index].fields[field.index()].ident)
}
ProjectionElem::Downcast(def, variant_index) => format!(
"{}",
def.variants[variant_index].fields[field.index()].ident
),
ProjectionElem::Field(_, field_type) => {
self.describe_field_from_ty(&field_type, field)
}

6
src/librustc_mir/borrow_check/mod.rs
View File

@ -1050,7 +1050,8 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
this.report_borrowed_value_does_not_live_long_enough(
context,
borrow,
place_span.1,
place_span,
Some(kind),
);
}
WriteKind::Mutate => {
@ -1328,7 +1329,8 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
self.report_borrowed_value_does_not_live_long_enough(
context,
borrow,
span,
(place, span),
None,
)
}
}

125
src/librustc_mir/borrow_check/nll/explain_borrow/mod.rs
View File

@ -8,11 +8,11 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use borrow_check::nll::region_infer::{Cause, RegionInferenceContext};
use borrow_check::{Context, MirBorrowckCtxt};
use borrow_check::borrow_set::BorrowData;
use borrow_check::nll::region_infer::{Cause, RegionInferenceContext};
use borrow_check::{Context, MirBorrowckCtxt, WriteKind};
use rustc::mir::visit::{MirVisitable, PlaceContext, Visitor};
use rustc::mir::{Local, Location, Mir};
use rustc::mir::{Local, Location, Mir, Place};
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::DiagnosticBuilder;
use util::liveness::{self, DefUse, LivenessMode};
@ -22,11 +22,21 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
/// point from `context`. This is key for the "3-point errors"
/// [described in the NLL RFC][d].
///
/// # Parameters
///
/// - `borrow`: the borrow in question
/// - `context`: where the borrow occurs
/// - `kind_place`: if Some, this describes the statement that triggered the error.
/// - first half is the kind of write, if any, being performed
/// - second half is the place being accessed
/// - `err`: where the error annotations are going to be added
///
/// [d]: https://rust-lang.github.io/rfcs/2094-nll.html#leveraging-intuition-framing-errors-in-terms-of-points
pub(in borrow_check) fn explain_why_borrow_contains_point(
&mut self,
context: Context,
borrow: &BorrowData<'tcx>,
kind_place: Option<(WriteKind, &Place<'tcx>)>,
err: &mut DiagnosticBuilder<'_>,
) {
let regioncx = &&self.nonlexical_regioncx;
@ -35,58 +45,68 @@ impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx> {
let borrow_region_vid = regioncx.to_region_vid(borrow.region);
if let Some(cause) = regioncx.why_region_contains_point(borrow_region_vid, context.loc) {
match cause {
Cause::LiveVar(local, location) => {
match find_regular_use(mir, regioncx, borrow, location, local) {
Some(p) => {
Cause::LiveVar(local, location) => match find_regular_use(
mir, regioncx, borrow, location, local,
) {
Some(p) => {
err.span_label(mir.source_info(p).span, format!("borrow later used here"));
}
None => {
span_bug!(
mir.source_info(context.loc).span,
"Cause should end in a LiveVar"
);
}
},
Cause::DropVar(local, location) => match find_drop_use(
mir, regioncx, borrow, location, local,
) {
Some(p) => match &mir.local_decls[local].name {
Some(local_name) => {
err.span_label(
mir.source_info(p).span,
format!("borrow later used here"),
format!("borrow later used here, when `{}` is dropped", local_name),
);
}
None => {
span_bug!(
mir.source_info(context.loc).span,
"Cause should end in a LiveVar"
);
}
}
}
if let Some((WriteKind::StorageDeadOrDrop, place)) = kind_place {
if let Place::Local(borrowed_local) = place {
let dropped_local_scope =
mir.local_decls[local].visibility_scope;
let borrowed_local_scope =
mir.local_decls[*borrowed_local].visibility_scope;
Cause::DropVar(local, location) => {
match find_drop_use(mir, regioncx, borrow, location, local) {
Some(p) => match &mir.local_decls[local].name {
Some(local_name) => {
err.span_label(
mir.source_info(p).span,
format!(
"borrow later used here, when `{}` is dropped",
local_name
),
);
if mir.is_sub_scope(borrowed_local_scope, dropped_local_scope) {
err.note(
"values in a scope are dropped \
in the opposite order they are defined",
);
}
}
}
None => {
err.span_label(
mir.local_decls[local].source_info.span,
"borrow may end up in a temporary, created here",
);
err.span_label(
mir.source_info(p).span,
"temporary later dropped here, \
potentially using the reference",
);
}
},
}
None => {
span_bug!(
mir.source_info(context.loc).span,
"Cause should end in a DropVar"
err.span_label(
mir.local_decls[local].source_info.span,
"borrow may end up in a temporary, created here",
);
err.span_label(
mir.source_info(p).span,
"temporary later dropped here, \
potentially using the reference",
);
}
},
None => {
span_bug!(
mir.source_info(context.loc).span,
"Cause should end in a DropVar"
);
}
}
},
Cause::UniversalRegion(region_vid) => {
if let Some(region) = regioncx.to_error_region(region_vid) {
@ -185,15 +205,12 @@ impl<'gcx, 'tcx> UseFinder<'gcx, 'tcx> {
..p
});
} else {
stack.extend(
block_data
.terminator()
.successors()
.map(|&basic_block| Location {
statement_index: 0,
block: basic_block,
}),
);
stack.extend(block_data.terminator().successors().map(|&basic_block| {
Location {
statement_index: 0,
block: basic_block,
}
}));
}
}
}

2
src/test/ui/dropck/dropck-eyepatch-extern-crate.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `dt` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/dropck/dropck-eyepatch-reorder.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `dt` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/dropck/dropck-eyepatch.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `dt` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/error-codes/E0597.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `x` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

4
src/test/ui/generator/dropck.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `gen` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `ref_` does not live long enough
--> $DIR/dropck.rs:22:11
@ -26,6 +28,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `gen` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 2 previous errors

2
src/test/ui/span/dropck-object-cycle.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `m` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

4
src/test/ui/span/dropck_direct_cycle_with_drop.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `d1` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `d2` does not live long enough
--> $DIR/dropck_direct_cycle_with_drop.rs:46:19
@ -21,6 +23,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `d1` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 2 previous errors

4
src/test/ui/span/dropck_misc_variants.nll.stderr
View File

@ -8,6 +8,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_w` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `v` does not live long enough
--> $DIR/dropck_misc_variants.rs:41:27
@ -20,6 +22,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_w` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 2 previous errors

2
src/test/ui/span/issue-24805-dropck-child-has-items-via-parent.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_d` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

6
src/test/ui/span/issue-24805-dropck-trait-has-items.nll.stderr
View File

@ -8,6 +8,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_d` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `d1` does not live long enough
--> $DIR/issue-24805-dropck-trait-has-items.rs:53:33
@ -19,6 +21,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_d` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `d1` does not live long enough
--> $DIR/issue-24805-dropck-trait-has-items.rs:59:20
@ -30,6 +34,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `_d` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 3 previous errors

2
src/test/ui/span/issue-24895-copy-clone-dropck.nll.stderr
View File

@ -8,6 +8,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `d2` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/issue-26656.nll.stderr
View File

@ -8,6 +8,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `zook` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/issue28498-reject-ex1.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `foo` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/issue28498-reject-lifetime-param.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `foo1` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/issue28498-reject-passed-to-fn.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `foo1` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/issue28498-reject-trait-bound.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `foo1` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to previous error

2
src/test/ui/span/send-is-not-static-std-sync.nll.stderr
View File

@ -63,6 +63,8 @@ LL | }
...
LL | }
| - borrow later used here, when `tx` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 6 previous errors

4
src/test/ui/span/vec_refs_data_with_early_death.nll.stderr
View File

@ -9,6 +9,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `v` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error[E0597]: `x` does not live long enough
--> $DIR/vec_refs_data_with_early_death.rs:27:12
@ -21,6 +23,8 @@ LL | }
| |
| borrowed value only lives until here
| borrow later used here, when `v` is dropped
|
= note: values in a scope are dropped in the opposite order they are defined
error: aborting due to 2 previous errors