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Update rfcs/generic-functions.md

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Co-authored-by: Tiffany Bennett <tiffany@tiffnix.com>
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Alan Jeffrey 2021-05-06 09:09:10 -05:00 • committed by GitHub
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rfcs/generic-functions.md
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@ -8,7 +8,7 @@ Extend the syntax and semantics of functions to support explicit generic functio
Currently Luau allows generic functions to be inferred but not given explicit type annotations. For example
```
```lua
function id(x) return x end
local x: string = id("hi")
local y: number = id(37)
@ -107,4 +107,4 @@ We did originally consider Rank-1 types, but the problem is that's not backward-
We could introduce syntax for generic types without changing the semantics, but then there'd be a gap between the syntax (where the types `() -> <a>(a) -> a` and `<a>() -> (a) -> a` are different) and the semantics (where they are not). As noted above, this isn't sound.
Rather than using Rank-N types, we could use SML-style polymorphism, but this would need something like the [value restriction](http://users.cis.fiu.edu/~smithg/cop4555/valrestr.html) to be sound.
Rather than using Rank-N types, we could use SML-style polymorphism, but this would need something like the [value restriction](http://users.cis.fiu.edu/~smithg/cop4555/valrestr.html) to be sound.