diff --git a/schala-lang/language/src/ast/operators.rs b/schala-lang/language/src/ast/operators.rs
index d02b6c5..b55d423 100644
--- a/schala-lang/language/src/ast/operators.rs
+++ b/schala-lang/language/src/ast/operators.rs
@@ -17,12 +17,7 @@ impl PrefixOp {
   }
 
   pub fn is_prefix(op: &str) -> bool {
-    match op {
-      "+" => true,
-      "-" => true,
-      "!" => true,
-      _ => false
-    }
+    matches!(op, "+" | "-" | "!")
   }
 }
 
@@ -54,7 +49,7 @@ impl BinOp {
   }
 }
 
-fn token_kind_to_sigil<'a>(tok: &'a TokenKind) -> Option<&'a str> {
+fn token_kind_to_sigil(tok: & TokenKind) -> Option<&str> {
   use self::TokenKind::*;
   Some(match tok {
     Operator(op) => op.as_str(),