fmt+clippy

crates/water/src/runtime/core.rs

@@ -38,13 +38,13 @@ impl H2O<Host> {
         }
 
         let engine = Engine::new(&wasm_config)?;
-        
+
         let module = Module::from_file(&engine, &conf.filepath)?;
-        
+
         let linker: Linker<Host> = Linker::new(&engine);
 
         // linker.allow_unknown_exports(true);
-        
+
         let host = Host::default();
         let store = Store::new(&engine, host);
 
@@ -152,23 +152,19 @@ impl H2O<Host> {
         let instance = linker.instantiate(&mut store, &module)?;
 
         // call _start function explicitly if there is one exported from the WATM module
-        let func = instance
-            .get_func(&mut store, "_start");
-
-        match func {
-            Some(func) => {
-                let mut res = vec![Val::null(); func.ty(&store).results().len()];
-                match func.call(&mut store, &[], &mut res) {
-                    Ok(_) => {}
-                    Err(e) => {
-                        return Err(anyhow::Error::msg(format!(
-                            "failed to call _start function: {}",
-                            e
-                        )))
-                    }
+        let func = instance.get_func(&mut store, "_start");
+
+        if let Some(func) = func {
+            let mut res = vec![Val::null(); func.ty(&store).results().len()];
+            match func.call(&mut store, &[], &mut res) {
+                Ok(_) => {}
+                Err(e) => {
+                    return Err(anyhow::Error::msg(format!(
+                        "failed to call _start function: {}",
+                        e
+                    )))
                 }
             }
-            None => {}
         }
 
         Ok(H2O {