[Ada] Additional error checking on index constraints with fixed-lower-bound ranges

Pierre-Marie de Rodat derodat@adacore.com
Fri Jun 18 08:38:27 GMT 2021

Error checks are added to disallow index constraints given with a
mixture of constrained and fixed-lower-bound ranges, and also to
disallow an index constraint with a fixed-lower-bound index applied to a
type or subtype with fixed-lower-bound indexes.

Tested on x86_64-pc-linux-gnu, committed on trunk


	* sem_ch3.adb (Constrain_Array): Add error checking for
	fixed-lower-bound and constrained index ranges applied
	inappropriately on subtypes of unconstrained and
	fixed-lower-bound array types.
	(Constrain_Index): Correct and refine comment related to
	fixed-lower-bound index ranges.
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