Hint about partial application in error where required labels are missing

[zth]

Just a small tweak. Happy for feedback on the hint message itself.

I'll add a changelog just before merging.

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commit: c5bd1ff

[mediremi]

Would it be possible to give a code example using the actual function and args the user tried to apply?

- Hint: Did you want to partially apply the function?
  You can do that by putting `...` just before the closing parens of the function call:
  f(v, ...)

[zth]

Definitely! Just problematic if the function application is large, but maybe it's fine.

[zth]

@mediremi turns out we're not in the error reporting place where we have the "rewrite the expr and show" facilities we normally have. But, I added a generic example that I think is good enough: c137929

What do you think?

[mediremi]

I'm happy with that 👍