Merge #1054: Mark WalletPolicyError as non-exhaustive

2b739c9 fix(wallet_policy): mark WalletPolicyError as non-exhaustive (Trevor Arjeski)

Pull request description:

  Mark WalletPolicyError as #[non_exhaustive] so future error variants can be added
  without breaking downstream exhaustive matches.


ACKs for top commit:
  apoelstra:
    ACK 2b739c9; successfully ran local tests


Tree-SHA512: 9905f76bc45f2d3ef4a1d1f267c68108883e4802fe9f130a3b543eccc25d0a8141e9638903eddb7bb669d4ae713e0e182c9f7f0680f2ef6260d2c051f9071cd3

Author: apoelstra

src/descriptor/wallet_policy/mod.rs

@@ -142,6 +142,7 @@ impl FromStr for WalletPolicy {
 
 /// WalletPolicy errors
 #[derive(Debug, PartialEq, Eq, Clone)]
+#[non_exhaustive]
 pub enum WalletPolicyError {
     /// A derivation path must be present when parsing a KeyExpression
     KeyExpressionParseMustHaveDerivPath,