Part of the work for a doc handler

schala-repl/src/language.rs

@@ -156,7 +156,7 @@ pub trait ProgrammingLanguageInterface {
   fn custom_interpreter_directives_help(&self) -> String {
     format!(">> No custom interpreter directives specified <<")
   }
-  fn get_doc(&mut self, _commands: &Vec<&str>) -> Option<String> {
+  fn get_doc(&self, _commands: &Vec<&str>) -> Option<String> {
     None
   }
 }