start function

src/optimizer.rs

@@ -26,6 +26,9 @@ pub fn optimize(
 		}
 	}
 
+	// If there is start function in module, it should stary
+	module.start_section().map(|ss| stay.insert(Symbol::Function(ss as usize)));
+
 	// All symbols used in data/element segments are also should be preserved
 	let mut init_symbols = Vec::new();
 	if let Some(data_section) = module.data_section() {