| use crate::infer::error_reporting::TypeErrCtxt; |
| use crate::infer::lexical_region_resolve::RegionResolutionError; |
| use crate::infer::lexical_region_resolve::RegionResolutionError::*; |
| use rustc_errors::{Diag, ErrorGuaranteed}; |
| use rustc_middle::ty::{self, TyCtxt}; |
| use rustc_span::Span; |
| |
| mod different_lifetimes; |
| pub mod find_anon_type; |
| mod mismatched_static_lifetime; |
| mod named_anon_conflict; |
| pub(crate) 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>, |
| ) -> Option<ErrorGuaranteed> { |
| NiceRegionError::new(self, error.clone()).try_report() |
| } |
| } |
| |
| 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<Diag<'tcx>> { |
| // 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(|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, |
| } |
| } |
| } |