Add a lifetime for data in the parsed result but not from the source.

src/wasm/macros.rs

@@ -3,7 +3,7 @@
 /// This exists to make changing the type signature easier.
 macro_rules! to_wasm {
     ($ostruct:ty, $istruct:ty, $original:ident, $wasm_context:ident, $standard_properties:ident, $fnbody:tt) => {
-        impl<'s> ToWasm for $istruct {
+        impl<'s, 'p> ToWasm for $istruct {
             type Output = $ostruct;
 
             fn to_wasm(