Deep delta Aggregates (GNAT Reference Manual)

#### 18.2.2 Deep delta Aggregates ¶

Ada 2022’s delta aggregates are extended to allow deep updates.

A delta aggregate may be used to specify new values for subcomponents of the copied base value, instead of only new values for direct components of the copied base value. This allows a more compact expression of updated values with a single delta aggregate, instead of multiple nested delta aggregates.

The syntax of delta aggregates in the extended version is the following: