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Implement List.find

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`List.find : List elem, (elem -> Bool) -> Result elem [ NotFound ]*`
behaves as follows:

```
>>> List.find [1, 2, 3] (\n -> n > 2)
Ok 2
>>> List.find [1, 2, 3] (\n -> n > 4)
Err NotFound
```

We implement this as builtin in two phases. First, we call out to a
pure-llvm-lowlevel `ListFindUnsafe` that returns a record indicating
whether a satisfying element was found, and the value of that element
(the value is all null bytes if the element wasn't found). Then, we lift
that record to a `Result` via a standard construction of the can AST.

Closes #1909
This commit is contained in:
ayazhafiz 2021-11-07 20:56:46 -05:00
parent 35df58c18f
commit f65b174ab5
16 changed files with 417 additions and 8 deletions
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2
compiler/module/src/symbol.rs
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@ -1066,6 +1066,8 @@ define_builtins! {
43 LIST_JOIN_MAP_CONCAT: "#joinMapConcat"
44 LIST_ANY: "any"
45 LIST_TAKE_FIRST: "takeFirst"
46 LIST_FIND: "find"
47 LIST_FIND_RESULT: "#find_result" // symbol used in the definition of List.find
}
5 RESULT: "Result" => {
0 RESULT_RESULT: "Result" imported // the Result.Result type alias