SCM_ASSERT_TYPE(pap, paper, SCM_ARG1, __FUNCTION__, "Paper definition");
SCM_ASSERT_TYPE(ly_c_string_p (markup), markup, SCM_ARG3, __FUNCTION__, "string");
SCM_ASSERT_TYPE(encoding == SCM_EOL
- || is_symbol (encoding), encoding, SCM_ARG2, __FUNCTION__, "symbol");
+ || ly_c_symbol_p (encoding), encoding, SCM_ARG2, __FUNCTION__, "symbol");
String str = ly_scm2string (markup);
Font_metric *fm = select_encoded_font (pap, props, encoding);