Satisfy more clippy.

src/ast/ast.rs

@@ -1012,7 +1012,20 @@ impl PartialEq for ASTNode<'_> {
 impl Eq for ASTNode<'_> {}
 
 impl ASTNode<'_> {
+    /// Is this [`ASTNode`] a [`Stmt`]?
+    #[inline(always)]
+    #[must_use]
+    pub const fn is_stmt(&self) -> bool {
+        matches!(self, Self::Stmt(..))
+    }
+    /// Is this [`ASTNode`] an [`Expr`]?
+    #[inline(always)]
+    #[must_use]
+    pub const fn is_expr(&self) -> bool {
+        matches!(self, Self::Expr(..))
+    }
     /// Get the [`Position`] of this [`ASTNode`].
+    #[inline]
     #[must_use]
     pub fn position(&self) -> Position {
         match self {

src/ast/flags.rs

@@ -6,7 +6,7 @@ use std::prelude::v1::*;
 
 /// A type representing the access mode of a function.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "metadata", derive(serde::Serialize))]
+#[cfg_attr(feature = "metadata", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "metadata", serde(rename_all = "camelCase"))]
 #[non_exhaustive]
 pub enum FnAccess {

src/ast/stmt.rs

@@ -926,10 +926,7 @@ impl Stmt {
     #[inline]
     #[must_use]
     pub const fn is_control_flow_break(&self) -> bool {
-        match self {
-            Self::Return(..) | Self::BreakLoop(..) => true,
-            _ => false,
-        }
+        matches!(self, Self::Return(..) | Self::BreakLoop(..))
     }
     /// Recursively walk this statement.
     /// Return `false` from the callback to terminate the walk.