be nice and don't slice

These are already slices, no need to slice them again

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -1970,7 +1970,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                             ) = &qself.kind {
                                 // If the path segment already has type params, we want to overwrite
                                 // them.
-                                match &path.segments[..] {
+                                match &path.segments {
                                     // `segment` is the previous to last element on the path,
                                     // which would normally be the `enum` itself, while the last
                                     // `_` `PathSegment` corresponds to the variant.
@@ -2671,7 +2671,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 // `Self` in trait or type alias.
                 assert_eq!(opt_self_ty, None);
                 self.prohibit_generics(path.segments.iter(), |err| {
-                    if let [hir::PathSegment { args: Some(args), ident, .. }] = &path.segments[..] {
+                    if let [hir::PathSegment { args: Some(args), ident, .. }] = &path.segments {
                         err.span_suggestion_verbose(
                             ident.span.shrink_to_hi().to(args.span_ext),
                             "the `Self` type doesn't accept type parameters",