19 Continuation Marks (BC)
A mark can be attached to the current continuation frame using scheme_set_cont_mark. To force the creation of a new frame (e.g., during a nested function call within your function), use scheme_push_continuation_frame, and then remove the frame with scheme_pop_continuation_frame.
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Add/sets a continuation mark in the current continuation.
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Creates a new continuation frame. The data record need not be
initialized, and it can be allocated on the C stack. Supply data to
scheme_pop_continuation_frame to remove the continuation frame.
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Removes a continuation frame created by scheme_push_continuation_frame.