The following declaration
exists in the declaration of package Standard:
Numeric_Error : exception renames Constraint_Error;
This is true even though
it is not shown in A.1
Reason: In Ada 83, it was unclear which
situations should raise Numeric_Error, and which should raise Constraint_Error.
The permissions of RM83-11.6 could often be used to allow the implementation
to raise Constraint_Error in a situation where one would normally expect
Numeric_Error. To avoid this confusion, all situations that raise Numeric_Error
in Ada 83 are changed to raise Constraint_Error in Ada 95. Numeric_Error
is changed to be a renaming of Constraint_Error to avoid most of the
upward compatibilities associated with this change.
In new code, Constraint_Error should be used
instead of Numeric_Error.
Ada 2005 and 2012 Editions sponsored in part by Ada-Europe