Use longer lifetime in try_report_from_nll return type

Author: matthewjasper

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/mod.rs

@@ -43,7 +43,7 @@ impl<'cx, 'tcx> NiceRegionError<'cx, 'tcx> {
         self.infcx.tcx
     }
 
-    pub fn try_report_from_nll(&self) -> Option<DiagnosticBuilder<'cx>> {
+    pub fn try_report_from_nll(&self) -> Option<DiagnosticBuilder<'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())

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/named_anon_conflict.rs

@@ -9,7 +9,7 @@ use rustc_middle::ty;
 impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
     /// When given a `ConcreteFailure` for a function with parameters containing a named region and
     /// an anonymous region, emit an descriptive diagnostic error.
-    pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<'a>> {
+    pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<'tcx>> {
         let (span, sub, sup) = self.regions()?;
 
         debug!(

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/placeholder_error.rs

@@ -16,7 +16,7 @@ use std::fmt::{self, Write};
 impl NiceRegionError<'me, 'tcx> {
     /// When given a `ConcreteFailure` for a function with arguments containing a named region and
     /// an anonymous region, emit a descriptive diagnostic error.
-    pub(super) fn try_report_placeholder_conflict(&self) -> Option<DiagnosticBuilder<'me>> {
+    pub(super) fn try_report_placeholder_conflict(&self) -> Option<DiagnosticBuilder<'tcx>> {
         match &self.error {
             ///////////////////////////////////////////////////////////////////////////
             // NB. The ordering of cases in this match is very
@@ -199,7 +199,7 @@ impl NiceRegionError<'me, 'tcx> {
         trait_def_id: DefId,
         expected_substs: SubstsRef<'tcx>,
         actual_substs: SubstsRef<'tcx>,
-    ) -> DiagnosticBuilder<'me> {
+    ) -> DiagnosticBuilder<'tcx> {
         debug!(
             "try_report_placeholders_trait(\
              vid={:?}, \