remove tcx from ObligationCauseCode::span

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -714,10 +714,7 @@ impl<'tcx> TypeRelatingDelegate<'tcx> for QueryTypeRelatingDelegate<'_, 'tcx> {
     }
 
     fn const_equate(&mut self, _a: Const<'tcx>, _b: Const<'tcx>) {
-        span_bug!(
+        span_bug!(self.cause.span(), "generic_const_exprs: unreachable `const_equate`");
-            self.cause.span(self.infcx.tcx),
-            "generic_const_exprs: unreachable `const_equate`"
-        );
     }
 
     fn normalization() -> NormalizationStrategy {

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

@@ -1435,7 +1435,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         swap_secondary_and_primary: bool,
         force_label: bool,
     ) {
-        let span = cause.span(self.tcx);
+        let span = cause.span();
 
         // For some types of errors, expected-found does not make
         // sense, so just ignore the values we were given.
@@ -2085,7 +2085,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
 
         debug!("report_and_explain_type_error(trace={:?}, terr={:?})", trace, terr);
 
-        let span = trace.cause.span(self.tcx);
+        let span = trace.cause.span();
         let failure_code = trace.cause.as_failure_code(terr);
         let mut diag = match failure_code {
             FailureCode::Error0038(did) => {

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

@@ -204,7 +204,7 @@ impl<'tcx> NiceRegionError<'_, 'tcx> {
         expected_substs: SubstsRef<'tcx>,
         actual_substs: SubstsRef<'tcx>,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        let span = cause.span(self.tcx());
+        let span = cause.span();
         let msg = format!(
             "implementation of `{}` is not general enough",
             self.tcx().def_path_str(trait_def_id),

compiler/rustc_infer/src/traits/error_reporting/mod.rs

@@ -27,10 +27,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
 
         if let Some(span) = self.tcx.hir().span_if_local(trait_item_def_id) {
             let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
-            err.span_label(
+            err.span_label(span, format!("definition of `{}` from trait", item_name));
-                span,
-                format!("definition of `{}` from trait", item_name),
-            );
         }
 
         err.span_label(error_span, format!("impl has extra requirement {}", requirement));

compiler/rustc_middle/src/traits/mod.rs

@@ -139,7 +139,7 @@ impl<'tcx> ObligationCause<'tcx> {
         ObligationCause { span, body_id: hir::CRATE_HIR_ID, code: Default::default() }
     }
 
-    pub fn span(&self, _tcx: TyCtxt<'tcx>) -> Span {
+    pub fn span(&self) -> Span {
         match *self.code() {
             ObligationCauseCode::MatchExpressionArm(box MatchExpressionArmCause {
                 arm_span,

compiler/rustc_trait_selection/src/traits/fulfill.rs

@@ -603,7 +603,7 @@ impl<'a, 'b, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'tcx> {
                         ),
                         (Err(ErrorHandled::Linted), _) | (_, Err(ErrorHandled::Linted)) => {
                             span_bug!(
-                                obligation.cause.span(self.selcx.tcx()),
+                                obligation.cause.span(),
                                 "ConstEquate: const_eval_resolve returned an unexpected error"
                             )
                         }

compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs

@@ -84,7 +84,7 @@ impl<'cx, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'cx, 'tcx> {
         // Run canonical query. If overflow occurs, rerun from scratch but this time
         // in standard trait query mode so that overflow is handled appropriately
         // within `SelectionContext`.
-        self.tcx.at(obligation.cause.span(self.tcx)).evaluate_obligation(c_pred)
+        self.tcx.at(obligation.cause.span()).evaluate_obligation(c_pred)
     }
 
     // Helper function that canonicalizes and runs the query. If an

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -742,7 +742,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                         | (_, Err(ErrorHandled::Reported(_))) => Ok(EvaluatedToErr),
                         (Err(ErrorHandled::Linted), _) | (_, Err(ErrorHandled::Linted)) => {
                             span_bug!(
-                                obligation.cause.span(self.tcx()),
+                                obligation.cause.span(),
                                 "ConstEquate: const_eval_resolve returned an unexpected error"
                             )
                         }

compiler/rustc_typeck/src/check/compare_method.rs

@@ -298,7 +298,7 @@ fn compare_predicate_entailment<'tcx>(
 
             let mut diag = struct_span_err!(
                 tcx.sess,
-                cause.span(tcx),
+                cause.span(),
                 E0053,
                 "method `{}` has an incompatible type for trait",
                 trait_m.name
@@ -492,7 +492,7 @@ fn extract_spans_for_error_reporting<'a, 'tcx>(
         TypeError::ArgumentSorts(ExpectedFound { .. }, i) => {
             (impl_args.nth(i).unwrap(), trait_args.and_then(|mut args| args.nth(i)))
         }
-        _ => (cause.span(tcx), tcx.hir().span_if_local(trait_m.def_id)),
+        _ => (cause.span(), tcx.hir().span_if_local(trait_m.def_id)),
     }
 }
 

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -1838,7 +1838,7 @@ fn check_false_global_bounds(fcx: &FnCtxt<'_, '_>, mut span: Span, id: hir::HirI
             if let Some(hir::Generics { predicates, .. }) =
                 hir_node.and_then(|node| node.generics())
             {
-                let obligation_span = obligation.cause.span(fcx.tcx);
+                let obligation_span = obligation.cause.span();
 
                 span = predicates
                     .iter()