Add Start/End to DebuggerEvent.

src/ast/ast.rs

@@ -848,6 +848,7 @@ impl AsRef<crate::Shared<crate::Module>> for AST {
 /// _(internals)_ An [`AST`] node, consisting of either an [`Expr`] or a [`Stmt`].
 /// Exported under the `internals` feature only.
 #[derive(Debug, Clone, Copy, Hash)]
+#[non_exhaustive]
 pub enum ASTNode<'a> {
     /// A statement ([`Stmt`]).
     Stmt(&'a Stmt),

src/ast/expr.rs

@@ -348,6 +348,7 @@ impl FloatWrapper<crate::FLOAT> {
 /// _(internals)_ An expression sub-tree.
 /// Exported under the `internals` feature only.
 #[derive(Clone, Hash)]
+#[non_exhaustive]
 pub enum Expr {
     /// Dynamic constant.
     ///

src/ast/stmt.rs

@@ -366,6 +366,7 @@ impl Extend<Stmt> for StmtBlock {
 /// _(internals)_ A statement.
 /// Exported under the `internals` feature only.
 #[derive(Debug, Clone, Hash)]
+#[non_exhaustive]
 pub enum Stmt {
     /// No-op.
     Noop(Position),