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Add tree syntax to syntax.md
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@ -622,6 +622,18 @@ A List literal is surrounded by `[` `]`. The elements must be separated by `,`.
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It is desugared to constructor calls of the built-in type List, `List/cons(head, ~tail)` and `List/nil` .
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### Tree Literals
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```python
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![![1, 2], ![3, 4]]
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```
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The Tree literals `![]` and `!` are used to create values of the built-in type `Tree`.
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`![a b]` is equivalent to `Tree/Node(a, b)`.
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`!x` is equivalent to `Tree/Leaf(x)`.
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### Map Literals
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```python
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@ -1131,6 +1143,18 @@ The syntax above is desugared to:
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Using `,` is optional.
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### Tree Literals
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```python
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![![1, 2], ![3, 4]]
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```
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The Tree literals `![]` and `!` are used to create values of the built-in type `Tree`.
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`![a b]` is equivalent to `Tree/Node(a, b)`.
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`!x` is equivalent to `Tree/Leaf(x)`.
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### Nat Literal
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```rust
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