/// Tag constants as specified in BOLT11
-use std::str::FromStr;
-use std::ffi::c_void;
+use alloc::str::FromStr;
+use core::ffi::c_void;
use core::convert::Infallible;
use bitcoin::hashes::Hash;
use crate::c_types::*;
+#[cfg(feature="no-std")]
+use alloc::{vec::Vec, boxed::Box};
#[no_mangle]