Simplify creating Lit

src/ast/lit.rs

@@ -53,6 +53,12 @@ impl HasSpan for NumLit {
     }
 }
 
+impl NumLit {
+    pub fn lit(self) -> Lit {
+        Lit::Num(self)
+    }
+}
+
 #[derive(Clone)]
 pub enum StringLitElem {
     /// Normal unescaped characters
@@ -100,6 +106,10 @@ impl StringLit {
             span: ident.span,
         }
     }
+
+    pub fn lit(self) -> Lit {
+        Lit::String(self)
+    }
 }
 
 impl HasSpan for StringLit {
@@ -144,6 +154,12 @@ impl HasSpan for TableLit {
     }
 }
 
+impl TableLit {
+    pub fn lit(self) -> Lit {
+        Lit::Table(self)
+    }
+}
+
 #[derive(Clone)]
 pub enum Lit {
     /// `nil`