TclStubs.tcl_UpVar2

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
struct TclStubs
extern (C)
int function(Tcl_Interp* interp, const(char)* frameName, const(char)* part1, const(char)* part2, const(char)* localName, int flags) nothrow tcl_UpVar2;

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