Erase regions before calculating layout for packed field capture

Author: compiler-errors

compiler/rustc_typeck/src/check/upvar.rs

@@ -1639,7 +1639,8 @@ fn restrict_repr_packed_field_ref_capture<'tcx>(
         match p.kind {
             ProjectionKind::Field(..) => match ty.kind() {
                 ty::Adt(def, _) if def.repr.packed() => {
-                    match tcx.layout_of(param_env.and(p.ty)) {
+                    // We erase regions here because they cannot be hashed
+                    match tcx.layout_of(param_env.and(tcx.erase_regions(p.ty))) {
                         Ok(layout) if layout.align.abi.bytes() == 1 => {
                             // if the alignment is 1, the type can't be further
                             // disaligned.