Function holochain_wasmer_guest::return_err_ptr

pub fn return_err_ptr(wasm_error: WasmError) -> DoubleUSize

Convert a WasmError to a GuestPtrLen as best we can. This is not necessarily straightforward as the serialization process can error recursively. In the worst case we can’t even serialize an enum variant, in which case we panic. The casts from usize to u32 are safe as long as the guest code is compiled for wasm32-unknown-unknown target.