mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Rollup merge of #107986 - lcnr:layout-placeholder, r=petrochenkov

Browse Source 
layout: deal with placeholders, ICE on bound types

A placeholder type is the same as a param as they represent "this could be any type". A bound type represents a type inside of a `for<T>` or `exists<T>`. When entering a forall or exists `T` should be instantiated as a existential (inference var) or universal (placeholder). You should never observe a bound variable without its binder.
This commit is contained in:
Matthias Krüger 2023-02-13 11:34:59 +01:00 committed by GitHub
commit 8701e80722
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
compiler/rustc_ty_utils/src/layout.rs
View File

@ -470,14 +470,11 @@ fn layout_of_uncached<'tcx>(
return Err(LayoutError::Unknown(ty));
}
ty::Placeholder(..)
| ty::GeneratorWitness(..)
| ty::GeneratorWitnessMIR(..)
| ty::Infer(_) => {
ty::Bound(..) | ty::GeneratorWitness(..) | ty::GeneratorWitnessMIR(..) | ty::Infer(_) => {
bug!("Layout::compute: unexpected type `{}`", ty)
}
ty::Bound(..) | ty::Param(_) | ty::Error(_) => {
ty::Placeholder(..) | ty::Param(_) | ty::Error(_) => {
return Err(LayoutError::Unknown(ty));
}
})