Peter Ammon e10a12c0f2 Rationalize certain edge cases for function execution ...

This concerns edge cases when executing a function. Historically, when we parse
fish script, we identify early whether or not it's a function; but only record
the function's name and not its properties (i.e. not its source).

This means that the function can change between parsing and execution. Example:

    function foo; echo alpha; end
    foo (function foo; echo beta; end)

This has historically output "beta" because the function is replaced as part of
its own arguments.

Worse is if the function is deleted:

    function foo; echo alpha; end
    foo (functions --erase foo)

This outputs an error but in an awkward place; that's OK since it's very rare.

Let's codify this behavior since someone might be depending on it.

2025-06-14 10:34:10 -07:00

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