Move one test from run-make-fulldeps to ui

src/test/run-make-fulldeps/extern-prelude/ep-vec.rs → src/test/ui/auxiliary/extern-prelude-vec.rs

@@ -1,3 +1,3 @@
-#![crate_type = "rlib"]
+#![crate_name = "Vec"]
 
 pub fn new(arg1: f32, arg2: ()) {}

src/test/run-make-fulldeps/extern-prelude/ep-lib.rs → src/test/ui/auxiliary/extern-prelude.rs

@@ -1,5 +1,3 @@
-#![crate_type = "rlib"]
-
 pub struct S;
 
 impl S {

src/test/ui/extern-prelude-fail.rs

@@ -0,0 +1,9 @@
+// compile-flags:--extern extern_prelude
+// aux-build:extern-prelude.rs
+
+// Extern prelude names are not available by absolute paths
+
+fn main() {
+    use extern_prelude::S; //~ ERROR unresolved import `extern_prelude`
+    let s = ::extern_prelude::S; //~ ERROR failed to resolve
+}

src/test/ui/extern-prelude-fail.stderr

@@ -0,0 +1,16 @@
+error[E0432]: unresolved import `extern_prelude`
+  --> $DIR/extern-prelude-fail.rs:7:9
+   |
+LL |     use extern_prelude::S;
+   |         ^^^^^^^^^^^^^^ maybe a missing `extern crate extern_prelude;`?
+
+error[E0433]: failed to resolve: maybe a missing `extern crate extern_prelude;`?
+  --> $DIR/extern-prelude-fail.rs:8:15
+   |
+LL |     let s = ::extern_prelude::S;
+   |               ^^^^^^^^^^^^^^ maybe a missing `extern crate extern_prelude;`?
+
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0432, E0433.
+For more information about an error, try `rustc --explain E0432`.

src/test/ui/extern-prelude.rs

@@ -0,0 +1,31 @@
+// compile-pass
+// compile-flags:--extern extern_prelude --extern Vec
+// aux-build:extern-prelude.rs
+// aux-build:extern-prelude-vec.rs
+
+fn basic() {
+    // It works
+    let s = extern_prelude::S;
+    s.external();
+}
+
+fn shadow_mod() {
+    // Local module shadows `extern_prelude` from extern prelude
+    mod extern_prelude {
+        pub struct S;
+
+        impl S {
+            pub fn internal(&self) {}
+        }
+    }
+
+    let s = extern_prelude::S;
+    s.internal(); // OK
+}
+
+fn shadow_prelude() {
+    // Extern prelude shadows standard library prelude
+    let x = Vec::new(0f32, ()); // OK
+}
+
+fn main() {}