Tony wrote:
> At lines 234sqq of vim9.txt:
>
> When {return-type} is omitted the return type will be
> decided upon by the first encountered `return`
> statement in the function. E.g., for: >
> return 'message'
> < The return type will be "string".
>
> At lines 290sqq:
>
> A function defined with `:def` must declare the return type. If there is no
> type then the function doesn't return anything.
>
> Reminder: In functions defined with :function, ":return" is equivalent
> with ":return 0" and fall-through to ":endfunction" implies ":return".
> Unless the opposite were clearly said, I would expect the same to
> apply (mutatis mutandis s/endfunction/enddef/) to new-style function.
>
> So I don't see how it is possible for a function not to declare a
> return type either explicitly (in the :def statement) or implicitly
> (in the first :return statement, or by fallback to integer if either
> the first return is just :return, or there is no explicit :return and
> the function returns only by falling through to its endpoint).
I should remove that text. I first thought it would be OK to get the
return type from the first return statement, like the type of a variable
can be inferred from the initialization. However, the return statement
can be anywhere, making it difficult to find the type. I prefer to
require explicitly specifying the type. It's also more in balance with
the argument types.
The new style functions do require a return statement, there is no
default.
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