rewrite use-suggestions-rust-2018 to rmake

tests/run-make/use-suggestions-rust-2018/Makefile

@@ -1,7 +0,0 @@
-include ../tools.mk
-
-all:
-	$(RUSTC) ep-nested-lib.rs
-
-	$(RUSTC) use-suggestions.rs --edition=2018 --extern ep_nested_lib=$(TMPDIR)/libep_nested_lib.rlib 2>&1 | $(CGREP) "use ep_nested_lib::foo::bar::Baz"
-

tests/run-make/use-suggestions-rust-2018/rmake.rs

@@ -0,0 +1,18 @@
+// The compilation error caused by calling on an unimported crate
+// should have a suggestion to write, say, crate::bar::Foo instead
+// of just bar::Foo. However, this suggestion used to only appear for
+// extern crate statements, not crate struct. After this was fixed in #51456,
+// this test checks that the correct suggestion is printed no matter what.
+// See https://github.com/rust-lang/rust/issues/51212
+
+use run_make_support::{rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("ep-nested-lib.rs").run();
+    rustc()
+        .input("use-suggestions.rs")
+        .edition("2018")
+        .extern_("ep_nested_lib", rust_lib_name("ep_nested_lib"))
+        .run_fail()
+        .assert_stderr_contains("use ep_nested_lib::foo::bar::Baz");
+}