Don't show (*) deduplicate if a node doesn't have any dependencies to show.

src/cargo/ops/tree/graph.rs

@@ -117,6 +117,11 @@ impl<'a> Graph<'a> {
         }
     }
 
+    /// Returns `true` if the given node has any outgoing edges.
+    pub fn has_outgoing_edges(&self, index: usize) -> bool {
+        !self.edges[index].0.is_empty()
+    }
+
     /// Gets a node by index.
     pub fn node(&self, index: usize) -> &Node {
         &self.nodes[index]

src/cargo/ops/tree/mod.rs

@@ -249,7 +249,15 @@ fn print_node<'a>(
     }
 
     let in_cycle = print_stack.contains(&node_index);
-    let star = if new && !in_cycle { "" } else { " (*)" };
+    // If this node does not have any outgoing edges, don't include the (*)
+    // since there isn't really anything "deduplicated", and it generally just
+    // adds noise.
+    let has_deps = graph.has_outgoing_edges(node_index);
+    let star = if (new && !in_cycle) || !has_deps {
+        ""
+    } else {
+        " (*)"
+    };
     println!("{}{}", format.display(graph, node_index), star);
 
     if !new || in_cycle {

tests/testsuite/tree.rs

@@ -47,7 +47,7 @@ foo v0.1.0 ([..]/foo)
 ├── a v1.0.0
 │   └── b v1.0.0
 │       └── c v1.0.0
-└── c v1.0.0 (*)
+└── c v1.0.0
 [build-dependencies]
 └── bdep v1.0.0
     └── b v1.0.0 (*)
@@ -109,7 +109,7 @@ b v0.1.0 ([..]/foo/b)
 ├── c v1.0.0 ([..]/foo/c)
 └── somedep v1.0.0
 
-c v1.0.0 ([..]/foo/c) (*)
+c v1.0.0 ([..]/foo/c)
 ",
         )
         .run();
@@ -379,7 +379,7 @@ foo v0.1.0 ([..]/foo)
 └── pm_host v1.0.0
 [build-dependencies]
 └── build_host_dep v1.0.0
-    └── hostdep v1.0.0 (*)
+    └── hostdep v1.0.0
 ",
         )
         .run();
@@ -430,8 +430,8 @@ foo v0.1.0 ([..]/foo)
 └── targetdep v1.0.0
 [build-dependencies]
 ├── build_host_dep v1.0.0
-│   ├── hostdep v1.0.0 (*)
+│   ├── hostdep v1.0.0
-│   └── targetdep v1.0.0 (*)
+│   └── targetdep v1.0.0
 └── build_target_dep v1.0.0
 [dev-dependencies]
 └── devdep v1.0.0
@@ -561,7 +561,7 @@ foo v0.1.0 ([..]/foo)
 │   └── c v1.0.0
 ├── b2 v1.0.0
 │   └── d v1.0.0
-└── c v1.0.0 (*)
+└── c v1.0.0
 ",
         )
         .run();
@@ -572,7 +572,7 @@ foo v0.1.0 ([..]/foo)
 c v1.0.0
 ├── b1 v1.0.0
 │   └── foo v0.1.0 ([..]/foo)
-└── foo v0.1.0 ([..]/foo) (*)
+└── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();
@@ -608,7 +608,7 @@ foo v0.1.0 ([..]/foo)
 └── common v1.0.0
 [build-dependencies]
 └── bdep v1.0.0
-    └── common v1.0.0 (*)
+    └── common v1.0.0
 ",
         )
         .run();
@@ -620,7 +620,7 @@ common v1.0.0
 ├── bdep v1.0.0
 │   [build-dependencies]
 │   └── foo v0.1.0 ([..]/foo)
-└── foo v0.1.0 ([..]/foo) (*)
+└── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();
@@ -637,7 +637,7 @@ foo v0.1.0 ([..]/foo)
 a v1.0.0
 b v1.0.0
 c v1.0.0
-c v1.0.0 (*)
+c v1.0.0
 bdep v1.0.0
 b v1.0.0 (*)
 devdep v1.0.0
@@ -658,7 +658,7 @@ fn prefix_depth() {
 1a v1.0.0
 2b v1.0.0
 3c v1.0.0
-1c v1.0.0 (*)
+1c v1.0.0
 1bdep v1.0.0
 2b v1.0.0 (*)
 1devdep v1.0.0
@@ -821,7 +821,7 @@ dog v1.0.0
 └── a v0.1.0 ([..]/foo/a)
 
 dog v2.0.0
-└── a v0.1.0 ([..]/foo/a) (*)
+└── a v0.1.0 ([..]/foo/a)
 ",
         )
         .run();
@@ -834,7 +834,7 @@ cat v1.0.0
     └── b v0.1.0 ([..]/foo/b)
 
 cat v2.0.0
-└── b v0.1.0 ([..]/foo/b) (*)
+└── b v0.1.0 ([..]/foo/b)
 ",
         )
         .run();
@@ -850,7 +850,7 @@ foo v0.1.0 ([..]/foo)
 |-- a v1.0.0
 |   `-- b v1.0.0
 |       `-- c v1.0.0
-`-- c v1.0.0 (*)
+`-- c v1.0.0
 [build-dependencies]
 `-- bdep v1.0.0
     `-- b v1.0.0 (*)
@@ -1076,7 +1076,7 @@ optdep v1.0.0
 └── bar v1.0.0
     └── foo v0.1.0 ([..]/foo)
     [build-dependencies]
-    └── foo v0.1.0 ([..]/foo) (*)
+    └── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();
@@ -1103,7 +1103,7 @@ bar v1.0.0
 
 bar v1.0.0
 [build-dependencies]
-└── foo v0.1.0 ([..]/foo) (*)
+└── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();
@@ -1191,7 +1191,7 @@ somedep v1.0.0
 somedep v1.0.0
 ├── foo v0.1.0 ([..]/foo)
 └── pm v1.0.0
-    └── foo v0.1.0 ([..]/foo) (*)
+    └── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();
@@ -1205,7 +1205,7 @@ somedep v1.0.0
 
 somedep v1.0.0
 └── pm v1.0.0
-    └── foo v0.1.0 ([..]/foo) (*)
+    └── foo v0.1.0 ([..]/foo)
 ",
         )
         .run();

tests/testsuite/tree_graph_features.rs

@@ -59,7 +59,7 @@ foo v0.1.0 ([..]/foo)
 │   │   └── optdep feature \"default\"
 │   │       ├── optdep v1.0.0
 │   │       └── optdep feature \"cat\"
-│   │           └── optdep v1.0.0 (*)
+│   │           └── optdep v1.0.0
 │   └── defaultdep feature \"f1\"
 │       ├── defaultdep v1.0.0 (*)
 │       └── defaultdep feature \"optdep\"
@@ -139,11 +139,11 @@ a v0.1.0 ([..]/foo/a)
 ├── b feature \"default\" (command-line)
 │   ├── b v0.1.0 ([..]/foo/b)
 │   └── b feature \"feat1\"
-│       └── b v0.1.0 ([..]/foo/b) (*)
+│       └── b v0.1.0 ([..]/foo/b)
 └── b feature \"feat2\"
-    └── b v0.1.0 ([..]/foo/b) (*)
+    └── b v0.1.0 ([..]/foo/b)
 
-b v0.1.0 ([..]/foo/b) (*)
+b v0.1.0 ([..]/foo/b)
 ",
         )
         .run();
@@ -154,7 +154,7 @@ b v0.1.0 ([..]/foo/b) (*)
 a v0.1.0 ([..]/foo/a)
 ├── a feature \"a1\"
 │   └── a feature \"default\" (command-line)
-└── a feature \"default\" (command-line) (*)
+└── a feature \"default\" (command-line)
 
 b v0.1.0 ([..]/foo/b)
 ├── b feature \"default\" (command-line)
@@ -218,7 +218,7 @@ foo v0.1.0 ([..]/foo)
 ├── foo feature \"default\" (command-line)
 ├── foo feature \"f1\" (command-line)
 └── foo feature \"opt\"
-    └── foo feature \"f1\" (command-line) (*)
+    └── foo feature \"f1\" (command-line)
 ",
         )
         .run();
@@ -234,9 +234,9 @@ notopt v1.0.0
 └── notopt feature \"default\"
     └── foo v0.1.0 ([..]/foo)
         ├── foo feature \"default\" (command-line)
-        ├── foo feature \"f1\" (command-line) (*)
+        ├── foo feature \"f1\" (command-line)
         └── foo feature \"opt\"
-            └── foo feature \"f1\" (command-line) (*)
+            └── foo feature \"f1\" (command-line)
 ",
         )
         .run();
@@ -247,7 +247,7 @@ notopt v1.0.0
 notopt v1.0.0
 ├── notopt feature \"animal\" (command-line)
 ├── notopt feature \"cat\"
-│   └── notopt feature \"animal\" (command-line) (*)
+│   └── notopt feature \"animal\" (command-line)
 └── notopt feature \"default\"
     └── foo v0.1.0 ([..]/foo)
         └── foo feature \"default\" (command-line)
@@ -277,7 +277,7 @@ opt2 v1.0.0
     └── foo v0.1.0 ([..]/foo)
         ├── foo feature \"f1\" (command-line)
         │   └── foo feature \"f2\" (command-line)
-        ├── foo feature \"f2\" (command-line) (*)
+        ├── foo feature \"f2\" (command-line)
         ├── foo feature \"opt\" (command-line)
         │   └── foo feature \"f1\" (command-line) (*)
         └── foo feature \"opt2\" (command-line)