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juvix/tests/positive/NoDependencies/Empty.juvix
Paul Cadman 6894300e5a
Support module imports in Juvix REPL (#2029)
This PR adds support for importing modules from within a Juvix project
in the Juvix REPL.

The imported module is checked (parsed, arity-checked, type-checked etc)
as normal and added to the REPL session scope. Any errors during the
checking phase is reported to the user.

### Notes:

* You must load a file before using `import`. This is because the REPL
needs to know which Juvix project is active.
* You may only import modules from within the same Juvix project. 

### Examples

After launching `juvix repl`:

#### `open import`

```
Stdlib.Prelude> open import Stdlib.Data.Int.Ord
Stdlib.Prelude> 1 == 1
true
```

#### `import as`

```
Stdlib.Prelude> import Stdlib.Data.Int.Ord as Int
Stdlib.Prelude> 1 Int.== 1
true
```

#### `import`then `open`

```
Stdlib.Prelude> import Stdlib.Data.Int.Ord as Int
Stdlib.Prelude> open Int
Stdlib.Prelude> 1 == 1
true
```

#### Line-terminating semicolons are ignored:

```
Stdlib.Prelude> import Stdlib.Data.Int.Ord as Int;;;;;
Stdlib.Prelude> 1 Int.== 1
true
```

* Closes https://github.com/anoma/juvix/issues/1951

---------

Co-authored-by: Jonathan Cubides <jonathan.cubides@uib.no>
2023-05-08 12:23:15 +02:00

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