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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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1
compiler/builtins/src/bitcode.rs
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@ -190,6 +190,7 @@ pub const LIST_CONCAT: &str = "roc_builtins.list.concat";
pub const LIST_SET: &str = "roc_builtins.list.set";
pub const LIST_SET_IN_PLACE: &str = "roc_builtins.list.set_in_place";
pub const LIST_ANY: &str = "roc_builtins.list.any";
pub const LIST_FIND_UNSAFE: &str = "roc_builtins.list.find_unsafe";
pub const DEC_FROM_F64: &str = "roc_builtins.dec.from_f64";
pub const DEC_EQ: &str = "roc_builtins.dec.eq";