f - allow user-defined signing error

Author: jkczyz

lightning/src/offers/merkle.rs

@@ -199,6 +199,7 @@ impl<'a> Iterator for TlvStream<'a> {
 mod tests {
 	use bitcoin::hashes::{Hash, sha256};
 	use bitcoin::secp256k1::{KeyPair, Secp256k1, SecretKey};
+	use core::convert::Infallible;
 	use crate::offers::offer::{Amount, OfferBuilder};
 	use crate::offers::invoice_request::InvoiceRequest;
 	use crate::offers::parse::Bech32Encode;
@@ -241,7 +242,7 @@ mod tests {
 			.build_unchecked()
 			.request_invoice(vec![0; 8], payer_keys.public_key())
 			.build_unchecked()
-			.sign(|digest| secp_ctx.sign_schnorr_no_aux_rand(digest, &payer_keys))
+			.sign::<_, Infallible>(|digest| Ok(secp_ctx.sign_schnorr_no_aux_rand(digest, &payer_keys)))
 			.unwrap();
 		assert_eq!(
 			invoice_request.to_string(),