Revert "cl-ast: Unify break, return, and unary expressions"

This reverts commit adb0fd229c.

compiler/cl-ast/src/ast.rs

@@ -398,6 +398,10 @@ pub enum ExprKind {
     If(If),
     /// A [For] expression: `for` Pattern `in` [`Expr`] [`Block`] [`Else`]?
     For(For),
+    /// A [Break] expression: `break` [`Expr`]?
+    Break(Break),
+    /// A [Return] expression `return` [`Expr`]?
+    Return(Return),
     /// A continue expression: `continue`
     Continue,
 }
@@ -478,8 +482,6 @@ pub enum UnaryKind {
     Not,
     /// A Loop expression: `loop` [`Block`]
     Loop,
-    Break,
-    Return,
     /// Unused
     At,
     /// Unused
@@ -598,3 +600,15 @@ pub struct For {
 pub struct Else {
     pub body: Option<Box<Expr>>,
 }
+
+/// A [Break] expression: `break` [`Expr`]?
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct Break {
+    pub body: Option<Box<Expr>>,
+}
+
+/// A [Return] expression `return` [`Expr`]?
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct Return {
+    pub body: Option<Box<Expr>>,
+}