Add Options associated type

schala-lang/language/src/schala.rs

@@ -174,6 +174,7 @@ fn stage_names() -> Vec<&'static str> {
 
 
 impl ProgrammingLanguageInterface for Schala {
+  type Options = ();
   fn language_name() -> String {
     "Schala".to_owned()
   }

schala-repl/src/language.rs

@@ -2,6 +2,7 @@ use std::collections::HashSet;
 use std::time;
 
 pub trait ProgrammingLanguageInterface {
+    type Options;
     fn language_name() -> String;
     fn source_file_suffix() -> String;