FR-001-014 4.1p8 [intro.compliance] Hardened implementation should not rely on contracts

[wg21bot]

The hardened implementation should be specified independently of contracts which are not a proven technology. All existing deployed field experience are not based on contracts.

Proposed change:

Change “contract violation” to “runtime violation”.

[inbal2l]

(Duplicates: #589, #690, #691)
Should be discussed with: #590