/*
 * Note: the first three fields must match exactly the fields in a
 * Tcl_Interp struct (see tcl.h). If you change one, be sure to change the
 * other.
 *
 * The interpreter's result is held in both the string and the
 * objResultPtr fields. These fields hold, respectively, the result's
 * string or object value. The interpreter's result is always in the
 * result field if that is non-empty, otherwise it is in objResultPtr.
 * The two fields are kept consistent unless some C code sets
 * interp->result directly. Programs should not access result and
 * objResultPtr directly; instead, they should always get and set the
 * result using procedures such as Tcl_SetObjResult, Tcl_GetObjResult, and
 * Tcl_GetStringResult. See the SetResult man page for details.
 */