RM 2 8 17-19 Pragmas - GNAT Reference Manual

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6.5 RM 2.8(17-19): Pragmas

"Normally, an implementation should not define pragmas that can make an illegal program legal, except as follows:

A pragma used to complete a declaration, such as a pragma Import;
A pragma used to configure the environment by adding, removing, or replacing library_items."

See RM 2.8(16); Pragmas.