miniscript: fix string serialization of and_n

We are incorrectly serializing and_n as "and_b".

In master this is fixed by
#722
which rewrites the Display impl completely.

CHANGELOG.md

@@ -1,3 +1,7 @@
+# # 12.3.0 - August 31, 2024
+
+- Fix incorrect string serialization of `and_b` [#735](https://github.com/rust-bitcoin/rust-miniscript/pull/735)
+
 # # 12.2.0 - July 20, 2024
 
 - Fix panics while decoding large miniscripts from script [#712](https://github.com/rust-bitcoin/rust-miniscript/pull/712)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "miniscript"
-version = "12.2.0"
+version = "12.3.0"
 authors = ["Andrew Poelstra <[email protected]>, Sanket Kanjalkar <[email protected]>"]
 license = "CC0-1.0"
 homepage = "https://github.com/rust-bitcoin/rust-miniscript/"

src/miniscript/astelem.rs

@@ -62,7 +62,7 @@ impl<Pk: MiniscriptKey, Ctx: ScriptContext> Terminal<Pk, Ctx> {
             Terminal::AndB(ref l, ref r) => fmt_2(f, "and_b(", l, r, is_debug),
             Terminal::AndOr(ref a, ref b, ref c) => {
                 if c.node == Terminal::False {
-                    fmt_2(f, "and_b(", a, b, is_debug)
+                    fmt_2(f, "and_n(", a, b, is_debug)
                 } else {
                     f.write_str("andor(")?;
                     conditional_fmt(f, a, is_debug)?;