--- a/crates/jrsonnet-evaluator/src/builtin/mod.rs
+++ b/crates/jrsonnet-evaluator/src/builtin/mod.rs
@@ -212,16 +212,12 @@
 		"extVar" => parse_args!(context, "std.extVar", args, 1, [
 			0, x: [Val::Str]!!Val::Str, vec![ValType::Str];
 		], {
-			Ok(with_state(|s| s.settings().ext_vars.get(&x).cloned()).ok_or_else(
-				|| UndefinedExternalVariable(x),
-			)?)
+			Ok(with_state(|s| s.settings().ext_vars.get(&x).cloned()).ok_or(UndefinedExternalVariable(x))?)
 		})?,
 		"native" => parse_args!(context, "std.native", args, 1, [
 			0, x: [Val::Str]!!Val::Str, vec![ValType::Str];
 		], {
-			Ok(with_state(|s| s.settings().ext_natives.get(&x).cloned()).map(|v| Val::Func(Rc::new(FuncVal::NativeExt(x.clone(), v)))).ok_or_else(
-				|| UndefinedExternalFunction(x),
-			)?)
+			Ok(with_state(|s| s.settings().ext_natives.get(&x).cloned()).map(|v| Val::Func(Rc::new(FuncVal::NativeExt(x.clone(), v)))).ok_or(UndefinedExternalFunction(x))?)
 		})?,
 		"filter" => parse_args!(context, "std.filter", args, 2, [
 			0, func: [Val::Func]!!Val::Func, vec![ValType::Func];
--- a/crates/jrsonnet-evaluator/src/ctx.rs
+++ b/crates/jrsonnet-evaluator/src/ctx.rs
@@ -63,7 +63,7 @@
 			.bindings
 			.get(&name)
 			.cloned()
-			.ok_or_else(|| VariableIsNotDefined(name))?)
+			.ok_or(VariableIsNotDefined(name))?)
 	}
 	pub fn into_future(self, ctx: FutureContext) -> Self {
 		{