add new tests

Author: b-naber

tests/ui/resolve/open-ns-10.rs

@@ -0,0 +1,8 @@
+// Tests that namespaced crate names are limited to two segments
+
+//@ aux-crate: nscrate::three::segments=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+//~? ERROR crate name `nscrate::three::segments` passed to `--extern` can have at most two segments.
+
+fn main() {}

tests/ui/resolve/open-ns-10.stderr

@@ -0,0 +1,2 @@
+error: crate name `nscrate::three::segments` passed to `--extern` can have at most two segments.
+

tests/ui/resolve/open-ns-11.rs

@@ -0,0 +1,12 @@
+// Tests that namespaced crate names are limited to two segments
+
+//@ aux-crate: std::utils=open-ns-my_api_utils.rs
+//@ compile-flags: -Z namespaced-crates
+//@ edition: 2024
+
+use std::utils::get_u32;
+//~^ ERROR unresolved import `std::utils`
+
+fn main() {
+    let _ = get_u32();
+}

tests/ui/resolve/open-ns-11.stderr

@@ -0,0 +1,9 @@
+error[E0432]: unresolved import `std::utils`
+  --> $DIR/open-ns-11.rs:7:10
+   |
+LL | use std::utils::get_u32;
+   |          ^^^^^ could not find `utils` in `std`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0432`.

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

@@ -13,5 +13,6 @@ macro_rules! import_and_call {
 }
 
 fn main() {
-    import_and_call!(my_api::utils::utils_helper, utils_helper)
+    import_and_call!(my_api::utils::utils_helper, utils_helper);
+    let _x = 4 + 5;
 }