rename RegionVariableOrigin::MiscVariable to RegionVariableOrigin::Misc

compiler/rustc_trait_selection/src/error_reporting/infer/region.rs

@@ -1015,7 +1015,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             s
         };
         let var_description = match var_origin {
-            RegionVariableOrigin::MiscVariable(_) => String::new(),
+            RegionVariableOrigin::Misc(_) => String::new(),
             RegionVariableOrigin::PatternRegion(_) => " for pattern".to_string(),
             RegionVariableOrigin::BorrowRegion(_) => " for borrow expression".to_string(),
             RegionVariableOrigin::Autoref(_) => " for autoref".to_string(),

compiler/rustc_trait_selection/src/solve/delegate.rs

@@ -154,7 +154,7 @@ impl<'tcx> rustc_next_trait_solver::delegate::SolverDelegate for SolverDelegate<
     ) -> ty::GenericArg<'tcx> {
         match arg.kind() {
             ty::GenericArgKind::Lifetime(_) => {
-                self.next_region_var(RegionVariableOrigin::MiscVariable(span)).into()
+                self.next_region_var(RegionVariableOrigin::Misc(span)).into()
             }
             ty::GenericArgKind::Type(_) => self.next_ty_var(span).into(),
             ty::GenericArgKind::Const(_) => self.next_const_var(span).into(),