Elide storage markers for internal locals when inlining

Author: tmiasko

compiler/rustc_mir_transform/src/inline.rs

@@ -616,7 +616,9 @@ impl<'tcx> Inliner<'tcx> {
                 // If there are any locals without storage markers, give them storage only for the
                 // duration of the call.
                 for local in callee_body.vars_and_temps_iter() {
-                    if integrator.always_live_locals.contains(local) {
+                    if !callee_body.local_decls[local].internal
+                        && integrator.always_live_locals.contains(local)
+                    {
                         let new_local = integrator.map_local(local);
                         caller_body[callsite.block].statements.push(Statement {
                             source_info: callsite.source_info,
@@ -629,7 +631,9 @@ impl<'tcx> Inliner<'tcx> {
                     // the slice once.
                     let mut n = 0;
                     for local in callee_body.vars_and_temps_iter().rev() {
-                        if integrator.always_live_locals.contains(local) {
+                        if !callee_body.local_decls[local].internal
+                            && integrator.always_live_locals.contains(local)
+                        {
                             let new_local = integrator.map_local(local);
                             caller_body[block].statements.push(Statement {
                                 source_info: callsite.source_info,