Use the proper singular form for workspace member dependencies in res…

…olver errors (#6128)

crates/uv-resolver/src/pubgrub/report.rs

@@ -1058,6 +1058,15 @@ impl PackageRange<'_> {
     /// be singular or plural e.g. if false use "<range> depends on <...>" and
     /// if true use "<range> depend on <...>"
     fn plural(&self) -> bool {
+        // If a workspace member, always use the singular form (otherwise, it'd be "all versions of")
+        if self
+            .formatter
+            .and_then(|formatter| formatter.format_workspace_member(self.package))
+            .is_some()
+        {
+            return false;
+        }
+
         let mut segments = self.range.iter();
         if let Some(segment) = segments.next() {
             // A single unbounded compatibility segment is always plural ("all versions of").

crates/uv/tests/workspace.rs

@@ -1381,7 +1381,7 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_extra() -> Result<()>
     ----- stderr -----
     Using Python 3.12.[X] interpreter at: [PYTHON-3.12]
       × No solution found when resolving dependencies:
-      ╰─▶ Because only bar is available and bar depends on anyio==4.2.0, we can conclude that bar depend on anyio==4.2.0.
+      ╰─▶ Because only bar is available and bar depends on anyio==4.2.0, we can conclude that bar depends on anyio==4.2.0.
           And because foo depends on anyio==4.1.0, we can conclude that foo and bar are incompatible.
           And because your workspace requires bar and foo, we can conclude that your workspace's requirements are unsatisfiable.
     "###
@@ -1440,7 +1440,7 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_dev() -> Result<()> {
     ----- stderr -----
     Using Python 3.12.[X] interpreter at: [PYTHON-3.12]
       × No solution found when resolving dependencies:
-      ╰─▶ Because bar depends on bar and bar depends on anyio==4.2.0, we can conclude that bar depend on anyio==4.2.0.
+      ╰─▶ Because bar depends on bar and bar depends on anyio==4.2.0, we can conclude that bar depends on anyio==4.2.0.
           And because foo depends on anyio==4.1.0, we can conclude that bar and foo are incompatible.
           And because your workspace requires bar and foo, we can conclude that your workspace's requirements are unsatisfiable.
     "###