1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
use crate::infer::error_reporting::TypeErrCtxt;
use crate::infer::lexical_region_resolve::RegionResolutionError;
use crate::infer::lexical_region_resolve::RegionResolutionError::*;
use rustc_errors::{DiagnosticBuilder, ErrorGuaranteed};
use rustc_middle::ty::{self, TyCtxt};
use rustc_span::source_map::Span;
mod different_lifetimes;
pub mod find_anon_type;
mod mismatched_static_lifetime;
mod named_anon_conflict;
mod placeholder_error;
mod placeholder_relation;
mod static_impl_trait;
mod trait_impl_difference;
mod util;
pub use different_lifetimes::suggest_adding_lifetime_params;
pub use find_anon_type::find_anon_type;
pub use static_impl_trait::{suggest_new_region_bound, HirTraitObjectVisitor, TraitObjectVisitor};
pub use util::find_param_with_region;
impl<'cx, 'tcx> TypeErrCtxt<'cx, 'tcx> {
pub fn try_report_nice_region_error(&'cx self, error: &RegionResolutionError<'tcx>) -> bool {
NiceRegionError::new(self, error.clone()).try_report().is_some()
}
}
pub struct NiceRegionError<'cx, 'tcx> {
cx: &'cx TypeErrCtxt<'cx, 'tcx>,
error: Option<RegionResolutionError<'tcx>>,
regions: Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)>,
}
impl<'cx, 'tcx> NiceRegionError<'cx, 'tcx> {
pub fn new(cx: &'cx TypeErrCtxt<'cx, 'tcx>, error: RegionResolutionError<'tcx>) -> Self {
Self { cx, error: Some(error), regions: None }
}
pub fn new_from_span(
cx: &'cx TypeErrCtxt<'cx, 'tcx>,
span: Span,
sub: ty::Region<'tcx>,
sup: ty::Region<'tcx>,
) -> Self {
Self { cx, error: None, regions: Some((span, sub, sup)) }
}
fn tcx(&self) -> TyCtxt<'tcx> {
self.cx.tcx
}
pub fn try_report_from_nll(&self) -> Option<DiagnosticBuilder<'tcx, ErrorGuaranteed>> {
// Due to the improved diagnostics returned by the MIR borrow checker, only a subset of
// the nice region errors are required when running under the MIR borrow checker.
self.try_report_named_anon_conflict()
.or_else(|| self.try_report_placeholder_conflict())
.or_else(|| self.try_report_placeholder_relation())
}
pub fn try_report(&self) -> Option<ErrorGuaranteed> {
self.try_report_from_nll()
.map(|mut diag| diag.emit())
.or_else(|| self.try_report_impl_not_conforming_to_trait())
.or_else(|| self.try_report_anon_anon_conflict())
.or_else(|| self.try_report_static_impl_trait())
.or_else(|| self.try_report_mismatched_static_lifetime())
}
pub(super) fn regions(&self) -> Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)> {
match (&self.error, self.regions) {
(Some(ConcreteFailure(origin, sub, sup)), None) => Some((origin.span(), *sub, *sup)),
(Some(SubSupConflict(_, _, origin, sub, _, sup, _)), None) => {
Some((origin.span(), *sub, *sup))
}
(None, Some((span, sub, sup))) => Some((span, sub, sup)),
_ => None,
}
}
}
|