Code
T1010 not-plain
Something stands where only what can be read as text may stand: in a definition that states plain: true and holds what makes it code.
Details
For a definition that states plain: true, the finding stands on the line of the first thing that makes it code, and names that thing: a let, a call of a function of the file's own, a method of a text or a list, and the rest of what a body may not hold.
The fix
Write it with our words alone: a value word in place of a method, a query or a change in place of a helper function. Or let it be code: take plain: true away.