The compiler must be able to know at compile time what the type of each data item is.

procedure myqinsert
          (element:myelement queue:myqueue)
  ...

Advantages:

• Type errors detected at compile time.

• No runtime type checking required.

Disadvantage:

• Rigidity: If there are queues of different kinds of elements, the queue handling routines will have to be duplicated for each element type.

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