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[spec] some fixes to tuples #18582

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Sep 22, 2023
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[spec] some fixes to tuples #18582

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4 changes: 2 additions & 2 deletions docs/_spec/03-types.md
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Expand Up @@ -239,13 +239,13 @@ SimpleType1 ::= ...
| ‘(’ TypesOrWildcards ‘)’
```

A _tuple type_ ´(T_1, ..., T_n)´ where ´n \geq 2´ is sugar for the type `´T_1´ *: ... *: ´T_n´ *: scala.EmptyTuple`, which is itself a series of nested infix types which are sugar for `*:[´T_1´, *:[´T_2´, ... *[´T_n´, scala.EmptyTuple]]]`.
A _tuple type_ ´(T_1, ..., T_n)´ where ´n \geq 2´ is sugar for the type `´T_1´ *: ... *: ´T_n´ *: scala.EmptyTuple`, which is itself a series of nested infix types which are sugar for `*:[´T_1´, *:[´T_2´, ... *:[´T_n´, scala.EmptyTuple]]]`.
The ´T_i´ can be wildcard type arguments.

Notes:

- `(´T_1´)` is the type ´T_1´, and not `´T_1´ *: scala.EmptyTuple` (´T_1´ cannot be a wildcard type argument in that case).
- `()` is not a valid type (not even `scala.EmptyTuple`).
- `()` is not a valid type (i.e. it is not desugared to `scala.EmptyTuple`).

### Concrete Refined Types

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