+ // All local crate implications need to have the feature that implies it confirmed to exist.
+ let mut remaining_implications =
+ tcx.stability_implications(rustc_hir::def_id::LOCAL_CRATE).clone();
+
+ // We always collect the lib features declared in the current crate, even if there are
+ // no unknown features, because the collection also does feature attribute validation.
+ let local_defined_features = tcx.lib_features(()).to_vec();
+ if !remaining_lib_features.is_empty() || !remaining_implications.is_empty() {
+ // Loading the implications of all crates is unavoidable to be able to emit the partial
+ // stabilization diagnostic, but it can be avoided when there are no
+ // `remaining_lib_features`.
+ let mut all_implications = remaining_implications.clone();
+ for &cnum in tcx.crates(()) {
+ all_implications.extend(tcx.stability_implications(cnum));
+ }
+
+ check_features(
+ tcx,
+ &mut remaining_lib_features,
+ &mut remaining_implications,
+ local_defined_features.as_slice(),
+ &all_implications,
+ );
+
+ for &cnum in tcx.crates(()) {
+ if remaining_lib_features.is_empty() && remaining_implications.is_empty() {
+ break;
+ }
+ check_features(
+ tcx,
+ &mut remaining_lib_features,
+ &mut remaining_implications,
+ tcx.defined_lib_features(cnum).to_vec().as_slice(),
+ &all_implications,
+ );
+ }
+ }
+