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01c45ab968
Adds type synonym declarations to the language, like so: ``` tydef Maybe a = Unit + a end def lookdown : Cmd (Maybe Text) = scan down end > lookdown it2 : Maybe Text = inl () ``` `tydef` behaves very similarly to `def` except that it defines a new (parameterized) type instead of a new term. Note that higher-kinded types are not yet supported; for example we cannot say `tydef Foo f = Unit + f Int` (in fact this would be a syntax error since type variables cannot be at the head of an application). However there is nothing stopping us from adding that in the future; I just wanted to keep things simple for now. If you know of any scenario code that would be a good candidate for using type synonyms, let me know --- it would be nice to update a few scenarios as a better stress test of type synonyms before merging this. Closes #153. |
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| .. | ||
| BFS-clear.sw | ||
| cat.sw | ||
| dfs.sw | ||
| fact.sw | ||
| list.sw | ||
| maybe.sw | ||
| multi-key-handler.sw | ||
| pilotmode.sw | ||
| wander.sw | ||