Rename AST structures to Tree and relocate freeing logic

v0/ast/declaration.h

@@ -10,7 +10,7 @@ typedef struct {
 
     /** @brief Whether the import is public or not. */
     bool is_public;
-} ImportDeclaration;
+} ImportTree;
 
 /**
  * A declaration that aliases one type to another.
@@ -20,8 +20,8 @@ typedef struct {
     const char* name;
 
     /** @brief The value of the alias. */
-    TypeExpression value;
-} AliasDeclaration;
+    TypeTree value;
+} AliasTree;
 
 /**
  * A declaration of a variable, which may be a constant or not, and may be static or not.
@@ -31,10 +31,10 @@ typedef struct {
     char* name;
 
     /** @brief The type of the variable. */
-    TypeExpression type;
+    TypeTree type;
 
     /** @brief The optional initializer expression. */
-    Expression* initializer;
+    ExpressionTree* initializer;
 
     /** @brief Whether the variable is public or not. */
     bool is_public;
@@ -44,6 +44,6 @@ typedef struct {
 
     /** @brief Whether the variable is a constant or not. */
     bool is_const;
-} VariableDeclaration;
+} VariableTree;
 
 #endif