Composite type fields names from C code

General Usage
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3

Right way:

jl_svec_t *field_names = jl_field_names(jtype);
for (int i = 0; i < nfields; i++) {
        jl_sym_t* name = (jl_sym_t*)jl_svecref(field_names, i);
        const char *c = jl_symbol_name(name);