SOURCE_FILE
  TYPE_ALIAS
    TYPE_KW "type"
    WHITESPACE " "
    NAME
      IDENT "Foo"
    WHITESPACE " "
    EQ "="
    WHITESPACE " "
    FN_PTR_TYPE
      FN_KW "fn"
      PARAM_LIST
        L_PAREN "("
        PARAM
          WILDCARD_PAT
            UNDERSCORE "_"
          COLON ":"
          WHITESPACE " "
          PATH_TYPE
            PATH
              PATH_SEGMENT
                NAME_REF
                  IDENT "bar"
        R_PAREN ")"
    SEMICOLON ";"
  WHITESPACE "\n"
