resolve: Account for new importable entities

src/test/ui/rust-2018/uniform-paths/auxiliary/cross-crate.rs

@@ -0,0 +1,5 @@
+// edition:2018
+
+pub use ignore as built_in_attr;
+pub use u8 as built_in_type;
+pub use rustfmt as tool_mod;

src/test/ui/rust-2018/uniform-paths/cross-crate.rs

@@ -0,0 +1,11 @@
+// edition:2018
+// aux-build:cross-crate.rs
+
+extern crate cross_crate;
+use cross_crate::*;
+
+#[built_in_attr] //~ ERROR cannot use a built-in attribute through an import
+#[tool_mod::skip] //~ ERROR cannot use a tool module through an import
+fn main() {
+    let _: built_in_type; // OK
+}

src/test/ui/rust-2018/uniform-paths/cross-crate.stderr

@@ -0,0 +1,26 @@
+error: cannot use a built-in attribute through an import
+  --> $DIR/cross-crate.rs:7:3
+   |
+LL | #[built_in_attr]
+   |   ^^^^^^^^^^^^^
+   |
+note: the built-in attribute imported here
+  --> $DIR/cross-crate.rs:5:5
+   |
+LL | use cross_crate::*;
+   |     ^^^^^^^^^^^^^^
+
+error: cannot use a tool module through an import
+  --> $DIR/cross-crate.rs:8:3
+   |
+LL | #[tool_mod::skip]
+   |   ^^^^^^^^
+   |
+note: the tool module imported here
+  --> $DIR/cross-crate.rs:5:5
+   |
+LL | use cross_crate::*;
+   |     ^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+