[fpc-pascal] Access Violation When SetLength(DynArray, Value)

[James Richters]

>With FPC 3.2.0 and newer you can do "Concat(MyArray, [TheNewElement])" or (if modeswitch ArrayOperators is active) "MyArray := MyArray + [TheNewElement]".

I have a lot of arrays of records, but I just build the record into the array elements, like this:
                                          SetLength(MathArray,Length(MathArray)+1);
                                          MathArray[High(MathArray)].Variable:=NewVariable;
                                          MathArray[High(MathArray)].Formula:=NewEquation;

Could either of the methods mentioned work directly with something like this or would I have to build the record first and do:
MyRecord.Variable:=NewVariable;
MyRecord.Formula:=NewEquation;
MathArray:= MathArray+ MyRecord;


I thought I would make my own IncArray() function:

Procedure IncArray(Var TheArray);
Begin
   SetLength(TheArray,Length(TheArray)+1);
End;

But I get a 'Type Mismatch'  Any ideas how this could be done?  Is this even possible without specifying the exact type of array?

James