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based on an earlier version of the Wolfram Language.
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ErrorBox

ErrorBox[boxes]
is a low-level box construct that represents boxes that cannot be interpreted in input or output.
  • ErrorBox[boxes] typically displays as the raw form of boxes together with underlining that indicates parts that cannot be interpreted.
MakeExpression generates ErrorBox structure when incomplete syntax is detected:
MakeExpression generates ErrorBox structure when incomplete syntax is detected:
In[1]:=
Click for copyable input
Out[1]=
New in 3