bjoernager/rust
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Check that opaque is a defining use, prefer pre-defined opaques

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This commit is contained in:
Michael Goulet 2023-05-17 20:45:14 +00:00
parent f3c9c21658
commit e3f8beaed6
3 changed files with 127 additions and 14 deletions
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36
compiler/rustc_middle/src/ty/util.rs
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@ -518,6 +518,42 @@ impl<'tcx> TyCtxt<'tcx> {
Ok(())
}
/// Checks whether each generic argument is simply a unique generic placeholder.
///
/// This is used in the new solver, which canonicalizes params to placeholders
/// for better caching.
pub fn uses_unique_placeholders_ignoring_regions(
self,
substs: SubstsRef<'tcx>,
) -> Result<(), NotUniqueParam<'tcx>> {
let mut seen = GrowableBitSet::default();
for arg in substs {
match arg.unpack() {
// Ignore regions, since we can't resolve those in a canonicalized
// query in the trait solver.
GenericArgKind::Lifetime(_) => {}
GenericArgKind::Type(t) => match t.kind() {
ty::Placeholder(p) => {
if !seen.insert(p.bound.var) {
return Err(NotUniqueParam::DuplicateParam(t.into()));
}
}
_ => return Err(NotUniqueParam::NotParam(t.into())),
},
GenericArgKind::Const(c) => match c.kind() {
ty::ConstKind::Placeholder(p) => {
if !seen.insert(p.bound) {
return Err(NotUniqueParam::DuplicateParam(c.into()));
}
}
_ => return Err(NotUniqueParam::NotParam(c.into())),
},
}
}
Ok(())
}
/// Returns `true` if `def_id` refers to a closure (e.g., `|x| x * 2`). Note
/// that closures have a `DefId`, but the closure *expression* also
/// has a `HirId` that is located within the context where the