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The following declaration
exists in the declaration of package Standard:
Numeric_Error : exception renames Constraint_Error;
Discussion: 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.
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