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Add lowering of array lengths in types

Browse source 
Now e.g.

```rust
fn a(b: [u8; 2]) {
}
```

will know about the length of b.
This commit is contained in:
Jade 2021-05-12 04:39:48 -07:00
parent 312f1fe20a
commit 8b147624ff
10 changed files with 114 additions and 79 deletions
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8
crates/hir_ty/src/infer/expr.rs
View file

@ -8,6 +8,7 @@ use hir_def::{
expr::{Array, BinaryOp, Expr, ExprId, Literal, Statement, UnaryOp},
path::{GenericArg, GenericArgs},
resolver::resolver_for_expr,
type_ref::ConstScalar,
AssocContainerId, FieldId, Lookup,
};
use hir_expand::name::{name, Name};
@ -15,9 +16,7 @@ use stdx::always;
use syntax::ast::RangeOp;
use crate::{
autoderef,
consts::ConstScalar,
dummy_usize_const,
autoderef, dummy_usize_const,
lower::lower_to_chalk_mutability,
mapping::from_chalk,
method_resolution, op,
@ -737,7 +736,8 @@ impl<'a> InferenceContext<'a> {
TyKind::Scalar(Scalar::Uint(UintTy::Usize)).intern(&Interner),
),
);
// FIXME: support length for Repeat array expressions
// FIXME: we don't know the length here because hir Exprs don't actually
// get the value out of the AST, even though it is there.
None
}
};