[vim] jsonencode() silently converts recursive containers into empty (#586)

[Nikolai Aleksandrovich Pavlov]

Consider the following script:

vim -u NONE --cmd 'let l=[]' --cmd 'call add(l, l)' --cmd 'echo jsonencode(l)'

This will echo [[]], but actually it should error out because recursive container cannot be represented in JSON.

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[Bram Moolenaar]

Nikolai Aleksandrovich Pavlov wrote:

> Consider the following script:
>
> vim -u NONE --cmd 'let l=[]' --cmd 'call add(l, l)' --cmd 'echo jsonencode(l)'
>
> This will echo [[]], but actually it should error out because
> recursive container cannot be represented in JSON.

Yeah, another case of either falling back to something or producing an
error. I assume nobody wants to intentionally convert a recursive
structure into JSON. OK, let's make that an error.

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[Christian Brabandt]

Closed #586.

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[Christian Brabandt]

seems to be fixed.