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The record type of message field descriptors. It contains

  • an immutable type field holding a promise,
  • an immutable repeated? field holding a boolean,
  • an immutable packed? field holding a boolean,
  • an immutable accessor field holding a procedure from instances of the containing message type to values of the field, with an optional default argument, and
  • an immutable mutator field holding a procedure that sets the field value in an instance of the containing message type.

The type field refers to a SRFI-99 record type descriptor of another protocol buffer message or to an enumeration or primitive type descriptor record. The field-info-type accessor automatically forces the promise contained in this field.