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Add subtype test

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Flaviu Tamas 2015-05-26 16:00:15 -04:00
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@ -38,3 +38,19 @@ woof
meow
10
```
## Testing subtypes
It is also possible to check if an object is of a given subtype with the `of` keyword. For example,
``` nimrod
echo(animals[0] of Dog)
echo(animals[0] of Cat)
echo(animals[0] of Animal)
```
``` console
$ nim c -r of_op.nim
true
false
true
```