SOURCE_FILE
  ERROR
    UNSAFE_KW "unsafe"
  WHITESPACE " "
  FN
    ASYNC_KW "async"
    WHITESPACE " "
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        R_CURLY "}"
  WHITESPACE "\n"
  CONST
    UNSAFE_KW "unsafe"
    WHITESPACE " "
    CONST_KW "const"
    WHITESPACE " "
    ERROR
      FN_KW "fn"
  WHITESPACE " "
  MACRO_CALL
    PATH
      PATH_SEGMENT
        NAME_REF
          IDENT "bar"
    TOKEN_TREE
      L_PAREN "("
      R_PAREN ")"
  WHITESPACE " "
  ERROR
    L_CURLY "{"
    R_CURLY "}"
  WHITESPACE "\n"
error 6: expected existential, fn, trait or impl
error 38: expected a name
error 40: missing type for `const` or `static`
error 40: expected SEMICOLON
error 44: expected BANG
error 46: expected SEMICOLON
error 47: expected an item