I don't think it's illegal.  The spec (Ye Dic, here) is incomplete.  It says what will be done if there is a verb train but is silent about other trains.

What the implementation does is accept any train and evaluate it. Thinking about it I don't see anything else you could do with a train; & I don't see anything bad coming from executing a train containing non-verbs; so I would vote to expand the spec to include all trains.

There would need to be discussion among The Wise before any such change.

Henry Rich

On 3/9/2020 11:36 PM, Jose Mario Quintana wrote:
Henry wrote:

Ye Dic mentions only verb trains under `: .
Therefore, the sentence ((<,'"') ` (an 1) (`:6)) is illegal in J because "1
is not a train of verbs (even if it is supported by j).  Correct? (This is
not a rhetorical question.)




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