commit: fix rand feature gate

Author: dr-orlovsky

commit_verify/src/mpc/mod.rs

@@ -22,6 +22,8 @@ mod block;
 
 pub use atoms::{Commitment, Leaf, Message, MessageMap, MultiSource, ProtocolId};
 pub use block::{LeafNotKnown, MerkleBlock, MerkleProof, UnrelatedProof};
-pub use tree::{Error, IntoIter, MerkleTree};
+#[cfg(feature = "rand")]
+pub use tree::Error;
+pub use tree::{IntoIter, MerkleTree};
 
 const LNPBP4_TAG: [u8; 16] = *b"urn:lnpbp:lnpbp4";

commit_verify/src/mpc/tree.rs

@@ -17,6 +17,7 @@ use std::collections::BTreeMap;
 use amplify::num::{u256, u4};
 use amplify::Wrapper;
 
+#[cfg(feature = "rand")]
 pub use self::commit::Error;
 use crate::merkle::{MerkleLeaves, MerkleNode};
 use crate::mpc::atoms::Leaf;