Kill error messges for not using Result

src/schala_lang/eval.rs

@@ -79,6 +79,7 @@ impl<'a> Evaluator<'a> {
         ast.into_iter()
             .map(|astnode| format!("{}", self.reduction_loop(astnode)))
             .collect()
+
     }
 
     fn add_binding(&mut self, var: String, value: ReducedValue) {

src/schala_lang/parser.rs

@@ -94,12 +94,12 @@ impl fmt::Display for Expression {
                 write!(f, "«function: {}, {} arg(s)»", name, parameters.len())
             }
             ListLiteral(ref items) => {
-                write!(f, "[ ");
+                write!(f, "[ ")?;
                 let mut iter = items.iter().peekable();
                 while let Some(item) = iter.next() {
-                    write!(f, "{}", item);
+                    write!(f, "{}", item)?;
                     if let Some(_) = iter.peek() {
-                        write!(f, ", ");
+                        write!(f, ", ")?;
                     }
                 }
                 write!(f, " ]")