compile: Print error messages on unimplemented relative imports.
diff --git a/py/compile.c b/py/compile.c
index 0e33ca2..f475979 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -1261,11 +1261,13 @@
         } else {
             // TODO not implemented
             // This covers relative imports starting with dot(s) like "from .foo import"
+            compile_syntax_error(comp, "Relative imports not implemented");
             assert(0);
         }
     } else {
         // TODO not implemented
         // This covers relative imports with dots only like "from .. import"
+        compile_syntax_error(comp, "Relative imports not implemented");
         assert(0);
     }
 }