diff --git a/core/src/syn/v1/builtin.rs b/core/src/syn/v1/builtin.rs
index 4a1b479d..b34c6b2a 100644
--- a/core/src/syn/v1/builtin.rs
+++ b/core/src/syn/v1/builtin.rs
@@ -85,8 +85,10 @@ macro_rules! impl_builtins {
 			)*
 
 			$(
-				if let Ok((i, x)) = $name($i){
-					return Ok((i,x))
+				match $name($i){
+					Ok((i,x)) => return Ok((i,x)),
+					Err(Err::Failure(x)) => return Err(Err::Failure(x)),
+					_ => {}
 				}
 			)*
 			($i,())