test: Add a test for #1697

Author: brson

src/test/compile-fail/issue-1697.rs

@@ -0,0 +1,7 @@
+// Testing that we don't fail abnormally after hitting the errors
+
+import unresolved::*; //! ERROR unresolved modulename
+//!^ ERROR unresolved does not name a module
+
+fn main() {
+}