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30 changes: 30 additions & 0 deletions docs/examples/polymorphism.mdx
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sidebar_position: 2
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import { Hidden } from "@site/src/components/Hidden";

# Polymorphism

_By Kaz, July 2023

## Types

What is the type of `f`?

```sml
fun f ([],[]) = f ([],[]) ^ "A"
| f (_,_) = f (_,_) ^ "A"
```

<Hidden>
Type: <code>('a list * 'b list) -> string</code> <br />

For a surprise, try putting the above function in the REPL!
</Hidden>