*	nesting depth of command interpretation within the interpreter. The
 *	'command' argument is the ASCII text of the command being evaluated -
 *	before any substitutions are performed. The 'commandInfo' argument
 *	gives a handle to the command procedure that will be evaluated. The
 *	'objc' and 'objv' parameters give the parameter vector that will be
 *	passed to the command procedure. Proc does not return a value.
 *
 *	It is permissible for 'proc' to call Tcl_SetCommandTokenInfo to change
 *	the command procedure or client data for the command being evaluated,
 *	and these changes will take effect with the current evaluation.
 *
 *	The 'level' argument specifies the maximum nesting level of calls to
 *	be traced. If the execution depth of the interpreter exceeds 'level',
 *	the trace callback is not executed.
 *
 *	The 'flags' argument is either zero or the value,
 *	TCL_ALLOW_INLINE_COMPILATION. If the TCL_ALLOW_INLINE_COMPILATION flag
 *	is not present, the bytecode compiler will not generate inline code