CLHS: Section 3.5.1.1.1

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## 3.5.1.1.1 Error Detection Time in Safe Calls

If an error is signaled in a safe call, the exact point of the signal is implementation-dependent. In particular, it might be signaled at compile time or at run time, and if signaled at run time, it might be prior to, during, or after executing the call. However, it is always prior to the execution of the body of the function being called.

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