Fix formatter getting rid of curly braces around multi-line constants.

CHANGELOG.md

@@ -12,6 +12,7 @@
 - **aiken-lang**: Fix list-pattern needlessly formatting over multiple lines. @KtorZ
 - **aiken-lang**: Fix formatter on long alternative patterns spanning over multiple lines. @KtorZ
 - **aiken-lang**: Fix needed parentheses under trace-if-false operator for todo, fail, unop & pipelines; removed when formatting. @KtorZ
+- **aiken-lang**: Fix formatter removing curly braces around multi-line constants. It's fine to not have curly braces, but it's the Aiken signature after all. @KtorZ
 
 ### Removed
 

crates/aiken-lang/src/format.rs

@@ -295,7 +295,7 @@ impl<'comments> Formatter<'comments> {
 
                 head.append(" =")
                     .append(break_("", " "))
-                    .append(self.expr(value, true))
+                    .append(self.expr(value, false))
                     .nest(INDENT)
                     .group()
             }

crates/aiken-lang/src/tests/format.rs

@@ -1340,3 +1340,15 @@ fn trace_if_false_fail() {
         "#
     );
 }
+
+#[test]
+fn multiline_constant() {
+    assert_format!(
+        r#"
+        const n: Int = {
+            let x = 0
+            x + 1
+        }
+        "#
+    );
+}

crates/aiken-lang/src/tests/snapshots/multiline_constant.snap

@@ -0,0 +1,8 @@
+---
+source: crates/aiken-lang/src/tests/format.rs
+description: "Code:\n\nconst n: Int = {\n    let x = 0\n    x + 1\n}\n"
+---
+const n: Int = {
+    let x = 0
+    x + 1
+  }