+| AST_EXPR_AND: ∀t:ast_base_type.
+ ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t)
+| AST_EXPR_OR: ∀t:ast_base_type.
+ ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t)
+| AST_EXPR_XOR: ∀t:ast_base_type.
+ ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t) → ast_expr d e (AST_TYPE_BASE t)