Add a test for grouped reexports (failing)

full-tests/reexports.rs

@@ -0,0 +1,12 @@
+
+use hello::{thingy, whatever};
+mod hello{
+    pub fn thingy(){}
+    /// ~REQUIRE-DELETED whatever
+    pub fn whatever(){}
+}
+
+fn main(){
+    "~MINIMIZE-ROOT let x = thingy";
+    let x = thingy();
+}