c.c

    found = MVM_6model_parametric_try_find_parameterization(tc, st, params);
    printf("MVM_6model_parametric_parameterize.1: trying to find for %s\n", st->debug_name);
    if (found) {
        printf("MVM_6model_parametric_parameterize.1: FOUND [%s]  \n", found->st->debug_name);
        result->o = found;
        return;
    }
    else {
        printf("MVM_6model_parametric_parameterize.1: NOT FOUND\n");
    }

txt.txt

MVM_6model_parametric_parameterize.1: trying to find for Array::TypedArray
MVM_6model_parametric_parameterize.1: NOT FOUND
ZZ1.1: Looking for Array::TypedArray[NQPArray]
MVM_6model_parametric_parameterize.1: trying to find for (null)
ZZ1.1: Looking for (null)[NQPArray]
MVM_6model_parametric_parameterize.1: FOUND [(null)]  
MVM_6model_parametric_parameterize.1: FOUND [Array[Mu]]  
MVM_6model_parametric_parameterize.1: trying to find for Callable
ZZ1.1: Looking for Callable[NQPArray]
Type check failed for return value; expected Array[Mu] but got Array[Mu]
  in sub foo at /home/zoffix/R/rakudo/Foo.pm6 (Foo) line 2
  in block <unit> at ../z.p6 line 2