[Ada] Document change to legality checks for Inox case statements

["Marc Poulhiès" <poulhies@adacore.com>]

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INOX (which is enabled via -gnatX) supports composite case-statement selectors.
As a temporary measure, simplify the coverage-related compile-time checks
for such case statements via two changes: an others choice is always
required for such a case statement, and no legality checks relating to
overlapping of case choices are performed.

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

gcc/ada/

	* doc/gnat_rm/implementation_defined_pragmas.rst: Document new
	temporary rule that a "when others =>" case choice must be given
	when casing on a composite selector.
	* gnat_rm.texi: Regenerate.

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diff --git a/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst b/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst
--- a/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst
+++ b/gcc/ada/doc/gnat_rm/implementation_defined_pragmas.rst
@@ -2262,7 +2262,8 @@ of GNAT specific extensions are recognized as follows:
   will not be executed if the earlier alternative "matches"). All possible
   values of the composite type shall be covered. The composite type of the
   selector shall be an array or record type that is neither limited
-  class-wide.
+  class-wide. Currently, a "when others =>" case choice is required; it is
+  intended that this requirement will be relaxed at some point.
 
   If a subcomponent's subtype does not meet certain restrictions, then
   the only value that can be specified for that subcomponent in a case


diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi
--- a/gcc/ada/gnat_rm.texi
+++ b/gcc/ada/gnat_rm.texi
@@ -3717,7 +3717,8 @@ set shall be a proper subset of the second (and the later alternative
 will not be executed if the earlier alternative “matches”). All possible
 values of the composite type shall be covered. The composite type of the
 selector shall be an array or record type that is neither limited
-class-wide.
+class-wide. Currently, a “when others =>” case choice is required; it is
+intended that this requirement will be relaxed at some point.
 
 If a subcomponent’s subtype does not meet certain restrictions, then
 the only value that can be specified for that subcomponent in a case