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Merge #8813

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8813: Get some more array lengths! r=lf- a=lf-

This is built on #8799 and thus contains its changes. I'll rebase it onto master when that one gets merged. It adds support for r-a understanding the length of:

* `let a: [u8; 2] = ...`
* `let a = b"aaa"`
* `let a = [0u8; 4]`

I have added support for getting the values of byte strings, which was not previously there. I am least confident in the correctness of this part and it probably needs some more tests, as we currently have only one test that exercised that part (!).

Fixes #2922.

Co-authored-by: Jade <software@lfcode.ca>
This commit is contained in:
bors[bot] 2021-05-16 01:53:12 +00:00 • committed by GitHub
commit a57bd59f35
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21 changed files with 427 additions and 136 deletions
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5
crates/hir/src/lib.rs
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@ -52,7 +52,9 @@ use hir_def::{
};
use hir_expand::{diagnostics::DiagnosticSink, name::name, MacroDefKind};
use hir_ty::{
autoderef, could_unify,
autoderef,
consteval::ConstExt,
could_unify,
method_resolution::{self, def_crates, TyFingerprint},
primitive::UintTy,
subst_prefix,
@ -1914,6 +1916,7 @@ impl Type {
substs.iter(&Interner).filter_map(|a| a.ty(&Interner)).any(go)
}
TyKind::Array(_ty, len) if len.is_unknown() => true,
TyKind::Array(ty, _)
| TyKind::Slice(ty)
| TyKind::Raw(_, ty)