X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_ast_lowering%2Fsrc%2Flib.rs;h=ce5893efa926d4651383bd38f07267020f84f23b;hb=5e04567ac7fb2d1e35cc52a02d499b6027b58a76;hp=8281164ab12070dc60beb1c3979baa1e692e75df;hpb=d10b47ef69a36590a04c76e8868093d251adfec6;p=rust.git

diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 8281164ab12..ce5893efa92 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -175,12 +175,7 @@ fn legacy_const_generic_args(&self, expr: &Expr) -> Option<Vec<usize>> {
                 return None;
             }
 
-            let partial_res = self.partial_res_map.get(&expr.id)?;
-            if partial_res.unresolved_segments() != 0 {
-                return None;
-            }
-
-            if let Res::Def(DefKind::Fn, def_id) = partial_res.base_res() {
+            if let Res::Def(DefKind::Fn, def_id) = self.partial_res_map.get(&expr.id)?.full_res()? {
                 // We only support cross-crate argument rewriting. Uses
                 // within the same crate should be updated to use the new
                 // const generics style.
@@ -753,12 +748,7 @@ fn lower_res(&mut self, res: Res<NodeId>) -> Res {
     }
 
     fn expect_full_res(&mut self, id: NodeId) -> Res<NodeId> {
-        self.resolver.get_partial_res(id).map_or(Res::Err, |pr| {
-            if pr.unresolved_segments() != 0 {
-                panic!("path not fully resolved: {:?}", pr);
-            }
-            pr.base_res()
-        })
+        self.resolver.get_partial_res(id).map_or(Res::Err, |pr| pr.expect_full_res())
     }
 
     fn expect_full_res_from_use(&mut self, id: NodeId) -> impl Iterator<Item = Res<NodeId>> {
@@ -1138,8 +1128,11 @@ fn lower_generic_arg(
                     // type and value namespaces. If we resolved the path in the value namespace, we
                     // transform it into a generic const argument.
                     TyKind::Path(ref qself, ref path) => {
-                        if let Some(partial_res) = self.resolver.get_partial_res(ty.id) {
-                            let res = partial_res.base_res();
+                        if let Some(res) = self
+                            .resolver
+                            .get_partial_res(ty.id)
+                            .and_then(|partial_res| partial_res.full_res())
+                        {
                             if !res.matches_ns(Namespace::TypeNS) {
                                 debug!(
                                     "lower_generic_arg: Lowering type argument as const argument: {:?}",
@@ -1206,8 +1199,7 @@ fn lower_path_ty(
         // by `ty_path`.
         if qself.is_none()
             && let Some(partial_res) = self.resolver.get_partial_res(t.id)
-            && partial_res.unresolved_segments() == 0
-            && let Res::Def(DefKind::Trait | DefKind::TraitAlias, _) = partial_res.base_res()
+            && let Some(Res::Def(DefKind::Trait | DefKind::TraitAlias, _)) = partial_res.full_res()
         {
             let (bounds, lifetime_bound) = self.with_dyn_type_scope(true, |this| {
                 let poly_trait_ref = this.ast_arena.ptr.alloc(PolyTraitRef {