1 use crate::infer::lexical_region_resolve::RegionResolutionError;
2 use crate::infer::lexical_region_resolve::RegionResolutionError::*;
3 use crate::infer::InferCtxt;
4 use rustc_errors::{DiagnosticBuilder, ErrorReported};
5 use rustc_middle::ty::{self, TyCtxt};
6 use rustc_span::source_map::Span;
8 mod different_lifetimes;
10 mod named_anon_conflict;
12 mod placeholder_error;
13 mod static_impl_trait;
14 mod trait_impl_difference;
17 impl<'cx, 'tcx> InferCtxt<'cx, 'tcx> {
18 pub fn try_report_nice_region_error(&self, error: &RegionResolutionError<'tcx>) -> bool {
19 NiceRegionError::new(self, error.clone()).try_report().is_some()
23 pub struct NiceRegionError<'cx, 'tcx> {
24 infcx: &'cx InferCtxt<'cx, 'tcx>,
25 error: Option<RegionResolutionError<'tcx>>,
26 regions: Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)>,
29 impl<'cx, 'tcx> NiceRegionError<'cx, 'tcx> {
30 pub fn new(infcx: &'cx InferCtxt<'cx, 'tcx>, error: RegionResolutionError<'tcx>) -> Self {
31 Self { infcx, error: Some(error), regions: None }
35 infcx: &'cx InferCtxt<'cx, 'tcx>,
37 sub: ty::Region<'tcx>,
38 sup: ty::Region<'tcx>,
40 Self { infcx, error: None, regions: Some((span, sub, sup)) }
43 fn tcx(&self) -> TyCtxt<'tcx> {
47 pub fn try_report_from_nll(&self) -> Option<DiagnosticBuilder<'cx>> {
48 // Due to the improved diagnostics returned by the MIR borrow checker, only a subset of
49 // the nice region errors are required when running under the MIR borrow checker.
50 self.try_report_named_anon_conflict().or_else(|| self.try_report_placeholder_conflict())
53 pub fn try_report(&self) -> Option<ErrorReported> {
54 self.try_report_from_nll()
59 .or_else(|| self.try_report_anon_anon_conflict())
60 .or_else(|| self.try_report_outlives_closure())
61 .or_else(|| self.try_report_static_impl_trait())
62 .or_else(|| self.try_report_impl_not_conforming_to_trait())
65 pub fn regions(&self) -> Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)> {
66 match (&self.error, self.regions) {
67 (Some(ConcreteFailure(origin, sub, sup)), None) => Some((origin.span(), sub, sup)),
68 (Some(SubSupConflict(_, _, origin, sub, _, sup)), None) => {
69 Some((origin.span(), sub, sup))
71 (None, Some((span, sub, sup))) => Some((span, sub, sup)),