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GetCaller returns the caller of the function that calls it.The argument skip is the number of stack frames to skip before recording in pc, with 0 identifying the frame for Callers itself and 1 identifying the caller of Callers.

low performance.

Must panics on non-nil errors.

must use defer Recover()not effective for calling defer func() {Recover()}().

RecoverFromPanic replaces the specified error with an error containing the original error, and the call tree when a panic occurs.

PanicHandlers is a list of functions which will be invoked when a panic happens.