Support parentheses in patterns under feature gate
This is a prerequisite for any other extensions to pattern syntax - `|` with multiple patterns, type ascription, `..PAT` in slice patterns.
Closes https://github.com/rust-lang/rfcs/issues/554
These changes were meant to be in
2b18d8fe9dc05415a8e6b7cadf879c7f7ebe020a (rebased from
12a230562e), but I messed up the rebase a
bit as the file had been moved.
This should not be needed: the new variable will be related to the old
ones, so if they are constrained, so is the new variable; if they are
not, and hence default to diverging, so will the new variable.
Introduce UnpackedKind
This adds an `UnpackedKind` type as a typesafe counterpart to `Kind`. This should make future changes to kinds (such as const generics!) more resilient, as the type-checker will be able to catch more potential issues.
r? @eddyb
cc @yodaldevoid
Fix exponential projection complexity on nested types
This implements solution 1 from https://github.com/rust-lang/rust/issues/38528#issuecomment-366263076.
The code quality is currently extremely poor, but we can improve them during review.
Blocking issues:
- we probably don't want a quadratic deduplication for obligations.
- is there an alternative to deduplication?
Based on #48315.
Needs changelog. Noticable improvement on compile time is expected.
Fix#38528Close#39684Close#43757
Allow for instantiating statics from upstream crates
This PR makes the infrastructure around translating statics a bit more flexible so that it can also instantiate statics from upstream crates if the need arises. This is preparatory work for a MIR-only RLIBs prototype, where the instantiation of a `static` may be deferred until a leaf crate.
r? @eddyb (feel free to assign to someone else if you're busy)
Remove "static item recursion checking" in favor of relying on cycle checks in the query engine
Tests are changed to use the cycle check error message instead. Some duplicate tests are removed.
r? @eddyb
detect wrong number of args when type-checking a closure
Instead of creating inference variables for those argument types, use
the trait error-reporting code to give a nicer error. This also
improves some other spans for existing tests.
Fixes#47244
r? @estebank
