<p>IMO just marking the position is too narrow.</p>
<p>In fact, inserting no character is even more likely to produce invalid syntax. Think of empty for-loop specification or empty rhs of an assignment. Actually _ is probably least problematic because in many languages  it's the only valid non-alphanumeric character in an identifier.</p>
<p>I also like b4n's idea, but it's more work and should be a separate PR.</p>

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