Underscore Variables
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bug
enhancement
good first issue
syntax
- Dominant language
- Rust
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Description
The underscore `_` is a valid variable name, but it doesn't mean the same as in prolog:
```
?- [1, 2] = [_|_].
true.
-- {1 2} = {_ .._}
- [false]
```
It ought to do the prolog thing i.e. spawn a **fresh** variable each time it's mentioned.
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