169cd87dbe
@nunoplopes @aqjune
I had to add a new primitive to allow you to execute a tactic from the
`main` function. The `main` function is in the `io` monad. The new
primitive has type:
```
meta constant io.run_tactic {α : Type} (a : tactic α) : io α
```
I also added a new test that shows how to use it.
The test displays all declarations that have the `nat` prefix.
cc @kha
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| io.lean | ||
| io_interface.lean | ||
| random.lean | ||