Catch parse errors in C

[dabroz]

When reloading Ruby scripts, currently I need to parse them twice to be able to catch parse errors:

mrbc_context* context = mrbc_context_new(mrb);
mrbc_filename(mrb, context, path);
parser_state* parser = mrb_parse_nstring(mrb, data, length, context);
int num_errors = parser->nerr;
mrb_parser_free(parser);
if (num_errors > 0)
{ ... }
mrb_load_nstring_cxt(mrb, data, length, context);

all because mrb_load_nstring_cxt is defined as

MRB_API mrb_value
mrb_load_nstring_cxt(mrb_state *mrb, const char *s, int len, mrbc_context *c)
{
  return load_exec(mrb, mrb_parse_nstring(mrb, s, len, c), c);
}

and load_exec in not in the mruby API.

Is there a different way to do it without parsing the file twice, or could we promote load_exec to API?