If I enter the following through mathematica (11.0) through UI $$\begin{cases} 1 &x \geq 0 \\ 0 &True \end{cases}$$ No error is reported. $$\begin{cases} 1 &x \geq 0 \\ 0 &True \end{cases} //InputForm$$ returns Piecewise[{{1, x >= 0}}, 0] However If I enter the same when the notebook is in debug mode it gives error

Syntax::sntxi: Incomplete expression; more input is needed .

So as it seems some syntax is incorrect on debug mode, correct otherwise. Is the systax correct or wrong ?

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    $\begingroup$ I can reproduce the problem. Can you report this to Wolfram Support? $\endgroup$ – Szabolcs Apr 10 '17 at 9:26

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