If a symbol name can only be imported from one place for a type, and
as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.
This has wide implications on error messages with types, for example,
shortening `std::vec::Vec` to just `Vec`, as long as there is no other
`Vec` importable anywhere.
This adds a new '-Z trim-diagnostic-paths=false' option to control this
feature.
On the good path, with no diagnosis printed, we should try to avoid
issuing this query, so we need to prevent trimmed_def_paths query on
several cases.
This change also relies on a previous commit that differentiates
between `Debug` and `Display` on various rustc types, where the latter
is trimmed and presented to the user and the former is not.
Add a bunch of const-generic revisions for `min_const_generics`
This adds a bunch of revisions to `const-generic` tests which is part of #75279, but doesn't cover everything.
r? @lcnr
Clean up errors in typeck and resolve
* Tweak ordering of suggestions
* Do not suggest similarly named enclosing item
* Point at item definition in foreign crates
* Add missing primary label
CC #34255.
Updated tests and error msgs
Update stderr from test
Update w/ lcnr comments
Change some tests around, and also updated Ord implementation for ParamKindOrd
Update w/ nits from lcnr
Added this test to ensure that reordering the parameters only works with the feature const
generics enabled.
Fixed nits
Also added another test to verify that intermixed lifetimes are forbidden
Implement the `min_const_generics` feature gate
Implements both https://github.com/rust-lang/lang-team/issues/37 and https://github.com/rust-lang/compiler-team/issues/332.
Adds the new feature gate `#![feature(min_const_generics)]`.
This feature gate adds the following limitations to using const generics:
- generic parameters must only be used in types if they are trivial. (either `N` or `{ N }`)
- generic parameters must be either integers, `bool` or `char`.
We do allow arbitrary expressions in associated consts though, meaning that the following is allowed,
even if `<[u8; 0] as Foo>::ASSOC` is not const evaluatable.
```rust
trait Foo {
const ASSOC: usize;
}
impl<const N: usize> Foo for [u8; N] {
const ASSOC: usize = 64 / N;
}
```
r? @varkor cc @eddyb @withoutboats
Remove trait LengthAtMost32
This is a continuation of https://github.com/rust-lang/rust/pull/74026 preserving the original burrbull's commit.
I talked to @burrbull, he suggested me to finish his PR.
correctly deal with unsorted generic parameters
We now stop sorting generic params and instead correctly handle unsorted params in the rest of the compiler.
We still restrict const params to come after type params though, so this PR does not change anything which
is visible to users.
This might slightly influence perf, so let's prevent any unintentional rollups. @bors rollup=never
r? @varkor
const generics triage
I went through all const generics issues and closed all issues which are already fixed.
Some issues already have a regression test but were not closed. Also doing this as part of this PR.
uff r? @eddyb @varkor
closes#61936closes#62878closes#63695closes#67144closes#68596closes#69816closes#70217closes#70507closes#70586closes#71348closes#71805closes#73120closes#73508closes#73730closes#74255
