One of the basic list-manipulation functions in the C API to the Tcl C Library. 
Does most of the work for both [linsert] and [lreplace].

Documentaton at http://www.tcl.tk/man/tcl8.5/TclLib/ListObj.htm.

Prototype:

int
'''Tcl_ListObjReplace'''(
Tcl_Interp *''interp'', 
Tcl_Obj *''listPtr'', 
int ''first'', 
int ''count'', 
int ''objc'', 
Tcl_Obj *const ''objv''[[]])



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