| // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use infer::InferCtxt; |
| use infer::lexical_region_resolve::RegionResolutionError; |
| use infer::lexical_region_resolve::RegionResolutionError::*; |
| use syntax::source_map::Span; |
| use ty::{self, TyCtxt}; |
| use util::common::ErrorReported; |
| |
| mod different_lifetimes; |
| mod find_anon_type; |
| mod named_anon_conflict; |
| mod outlives_closure; |
| mod static_impl_trait; |
| mod util; |
| |
| impl<'cx, 'gcx, 'tcx> InferCtxt<'cx, 'gcx, 'tcx> { |
| pub fn try_report_nice_region_error(&self, error: &RegionResolutionError<'tcx>) -> bool { |
| match *error { |
| ConcreteFailure(..) | SubSupConflict(..) => {} |
| _ => return false, // inapplicable |
| } |
| |
| if let Some(tables) = self.in_progress_tables { |
| let tables = tables.borrow(); |
| NiceRegionError::new(self.tcx, error.clone(), Some(&tables)).try_report().is_some() |
| } else { |
| NiceRegionError::new(self.tcx, error.clone(), None).try_report().is_some() |
| } |
| } |
| } |
| |
| pub struct NiceRegionError<'cx, 'gcx: 'tcx, 'tcx: 'cx> { |
| tcx: TyCtxt<'cx, 'gcx, 'tcx>, |
| error: Option<RegionResolutionError<'tcx>>, |
| regions: Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)>, |
| tables: Option<&'cx ty::TypeckTables<'tcx>>, |
| } |
| |
| impl<'cx, 'gcx, 'tcx> NiceRegionError<'cx, 'gcx, 'tcx> { |
| pub fn new( |
| tcx: TyCtxt<'cx, 'gcx, 'tcx>, |
| error: RegionResolutionError<'tcx>, |
| tables: Option<&'cx ty::TypeckTables<'tcx>>, |
| ) -> Self { |
| Self { tcx, error: Some(error), regions: None, tables } |
| } |
| |
| pub fn new_from_span( |
| tcx: TyCtxt<'cx, 'gcx, 'tcx>, |
| span: Span, |
| sub: ty::Region<'tcx>, |
| sup: ty::Region<'tcx>, |
| tables: Option<&'cx ty::TypeckTables<'tcx>>, |
| ) -> Self { |
| Self { tcx, error: None, regions: Some((span, sub, sup)), tables } |
| } |
| |
| pub fn try_report_from_nll(&self) -> Option<ErrorReported> { |
| // 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() |
| } |
| |
| pub fn try_report(&self) -> Option<ErrorReported> { |
| self.try_report_named_anon_conflict() |
| .or_else(|| self.try_report_anon_anon_conflict()) |
| .or_else(|| self.try_report_outlives_closure()) |
| .or_else(|| self.try_report_static_impl_trait()) |
| } |
| |
| pub fn get_regions(&self) -> (Span, ty::Region<'tcx>, ty::Region<'tcx>) { |
| match (&self.error, self.regions) { |
| (&Some(ConcreteFailure(ref origin, sub, sup)), None) => (origin.span(), sub, sup), |
| (&Some(SubSupConflict(_, ref origin, sub, _, sup)), None) => (origin.span(), sub, sup), |
| (None, Some((span, sub, sup))) => (span, sub, sup), |
| (Some(_), Some(_)) => panic!("incorrectly built NiceRegionError"), |
| _ => panic!("trying to report on an incorrect lifetime failure"), |
| } |
| } |
| } |