Add test cases for namespaced crates

tests/ui/resolve/auxiliary/open-ns-mod-my_api.rs

@@ -0,0 +1,9 @@
+pub mod utils {
+    pub fn root_helper() {
+        println!("root_helper");
+    }
+}
+
+pub fn root_function() -> String {
+    "my_api root!".to_string()
+}

tests/ui/resolve/auxiliary/open-ns-my_api.rs

@@ -0,0 +1,3 @@
+pub fn root_function() -> String {
+    "my_api root!".to_string()
+}

tests/ui/resolve/auxiliary/open-ns-my_api_core.rs

@@ -0,0 +1,15 @@
+// #![crate_name = "my_api::core"]
+
+pub mod util {
+    pub fn core_mod_fn() -> String {
+        format!("core_fn from my_api::core::util",)
+    }
+}
+
+pub fn core_fn() -> String {
+    format!("core_fn from my_api::core!",)
+}
+
+pub fn core_fn2() -> String {
+    format!("core_fn2 from my_api::core!",)
+}

tests/ui/resolve/auxiliary/open-ns-my_api_utils.rs

@@ -0,0 +1,9 @@
+pub mod util {
+    pub fn util_mod_helper() -> String {
+        format!("Helper from my_api::utils::util",)
+    }
+}
+
+pub fn utils_helper() -> String {
+    format!("Helper from my_api::utils!",)
+}

tests/ui/resolve/open-ns-1.rs

@@ -0,0 +1,19 @@
+//@ build-pass
+//@ aux-crate:my_api=open-ns-my_api.rs
+//@ aux-crate:my_api::utils=open-ns-my_api_utils.rs
+//@ aux-crate:my_api::core=open-ns-my_api_core.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+use my_api::root_function;
+use my_api::utils::util;
+
+fn main() {
+    let _ = root_function();
+    let _ = my_api::root_function();
+    let _ = my_api::utils::utils_helper();
+    let _ = util::util_mod_helper();
+    let _ = my_api::core::core_fn();
+}

tests/ui/resolve/open-ns-2.rs

@@ -0,0 +1,19 @@
+//@ build-pass
+//@ aux-crate: my_api=open-ns-my_api.rs
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ aux-crate: my_api::core=open-ns-my_api_core.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+use my_api::core::{core_fn, core_fn2};
+use my_api::utils::*;
+use my_api::*;
+
+fn main() {
+    let _ = root_function();
+    let _ = utils_helper();
+    let _ = core_fn();
+    let _ = core_fn2();
+}

tests/ui/resolve/open-ns-3.rs

@@ -0,0 +1,18 @@
+// This test should fail with `utils` being defined multiple times, since open-ns-mod-my_api.rs
+// includes a `mod utils` and we also include open-ns-my_api_utils.rs as a namespaced crate at
+// my_api::utils.
+
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//@ build-pass
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+fn main() {
+    // FIXME test should fail with conflict here, but unsure how to do error annotation
+    // in auxiliary crate.
+    // let _ = my_api::root_function();
+    // let _ = my_api::utils::root_helper();
+    let _ = my_api::utils::utils_helper();
+}

tests/ui/resolve/open-ns-4.rs

@@ -0,0 +1,15 @@
+// This test makes sure namespaced crates work if we don't use any use statements but instead fully
+// qualify all references.
+
+//@ aux-crate: my_api=open-ns-my_api.rs
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//@ build-pass
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+fn main() {
+    let _ = my_api::root_function();
+    let _ = my_api::utils::utils_helper();
+}

tests/ui/resolve/open-ns-5.rs

@@ -0,0 +1,13 @@
+// This test makes sure namespaced crates work if we don't use any use statements but instead fully
+// qualify all references and we only have a single namespaced crate with no parent crate.
+
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//@ build-pass
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+fn main() {
+    let _ = my_api::utils::utils_helper();
+}

tests/ui/resolve/open-ns-6.rs

@@ -0,0 +1,19 @@
+// Tests that namespaced crate names work inside macros.
+
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//@ build-pass
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+macro_rules! import_and_call {
+    ($import_path:path, $fn_name:ident) => {{
+        use $import_path;
+        $fn_name();
+    }};
+}
+
+fn main() {
+    import_and_call!(my_api::utils::utils_helper, utils_helper)
+}

tests/ui/resolve/open-ns-7.rs

@@ -0,0 +1,13 @@
+//@ aux-crate: my_api::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//@ build-pass
+
+//@ ignore-test FIXME(packages_as_namespaces): feature not implemented yet
+
+use my_api; // FIXME can be resolved even though it (maybe?) shouldn't be
+use my_api::utils::utils_helper;
+
+fn main() {
+    let _ = utils_helper();
+}