difftastic/vendored_parsers/tree-sitter-hack/test/cases/expressions/binary-null-as.exp

(script
  (expression_statement
    (binary_expression
      left: (subscript_expression
        (variable)
        (string))
      right: (as_expression
        left: (integer)
        right: (type_specifier))))
  (expression_statement
    (binary_expression
      left: (subscript_expression
        (variable)
        (string))
      right: (as_expression
        left: (null)
        right: (type_specifier)))))