Allow self-depedencies in the dev section (#7943)

#7766 banned using `uv add` to
create self-dependencies in the `dev` section which breaks `uv add --dev
.[extra]` which is a fair use-case for adding a self-dependency.

Maybe we should only allow this if the added requirement includes an
extra group? Otherwise it's a bit weird.

crates/uv/src/commands/project/add.rs

@@ -341,16 +341,13 @@ pub(crate) async fn add(
     };
 
     // If any of the requirements are self-dependencies, bail.
-    if matches!(
-        dependency_type,
-        DependencyType::Production | DependencyType::Dev
-    ) {
+    if matches!(dependency_type, DependencyType::Production) {
         if let Target::Project(project, _) = &target {
             if let Some(project_name) = project.project_name() {
                 for requirement in &requirements {
                     if requirement.name == *project_name {
                         bail!(
-                            "Requirement name `{}` matches project name `{}`, but self-dependencies are not permitted. If your project name (`{}`) is shadowing that of a third-party dependency, consider renaming the project.",
+                            "Requirement name `{}` matches project name `{}`, but self-dependencies are not permitted without the `--dev` or `--optional` flags. If your project name (`{}`) is shadowing that of a third-party dependency, consider renaming the project.",
                             requirement.name.cyan(),
                             project_name.cyan(),
                             project_name.cyan(),

crates/uv/tests/edit.rs

@@ -4959,7 +4959,7 @@ fn add_self() -> Result<()> {
     ----- stdout -----
 
     ----- stderr -----
-    error: Requirement name `anyio` matches project name `anyio`, but self-dependencies are not permitted. If your project name (`anyio`) is shadowing that of a third-party dependency, consider renaming the project.
+    error: Requirement name `anyio` matches project name `anyio`, but self-dependencies are not permitted without the `--dev` or `--optional` flags. If your project name (`anyio`) is shadowing that of a third-party dependency, consider renaming the project.
     "###);
 
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
@@ -5023,12 +5023,16 @@ fn add_self() -> Result<()> {
 
     // And recursive development dependencies
     uv_snapshot!(context.filters(), context.add().arg("anyio[types]").arg("--dev"), @r###"
-    success: false
-    exit_code: 2
+    success: true
+    exit_code: 0
     ----- stdout -----
 
     ----- stderr -----
-    error: Requirement name `anyio` matches project name `anyio`, but self-dependencies are not permitted. If your project name (`anyio`) is shadowing that of a third-party dependency, consider renaming the project.
+    Resolved 2 packages in [TIME]
+    Prepared 1 package in [TIME]
+    Uninstalled 1 package in [TIME]
+    Installed 1 package in [TIME]
+     ~ anyio==0.1.0 (from file://[TEMP_DIR]/)
     "###);
 
     let pyproject_toml = context.read("pyproject.toml");
@@ -5054,6 +5058,11 @@ fn add_self() -> Result<()> {
         requires = ["setuptools>=42"]
         build-backend = "setuptools.build_meta"
 
+        [tool.uv]
+        dev-dependencies = [
+            "anyio[types]",
+        ]
+
         [tool.uv.sources]
         anyio = { workspace = true }
         "###