Support safe navigation operator #487
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The safe navigation operator is an operator from the name, but it's a variety of dot token for method calling. So TkSAFENAV class inherited Token class instead of TkOp class.
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The safe navigation operator is an operator from the name, but it's a variety of dot token for method calling. So
TkSAFENAVclass inheritedTokenclass instead ofTkOpclass.