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lcnr 2022-03-11 09:51:42 +01:00
parent 01ad0ad653
commit c833a9b4b4
1 changed files with 4 additions and 7 deletions
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11
compiler/rustc_infer/src/infer/higher_ranked/mod.rs
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@ -58,14 +58,11 @@ pub fn higher_ranked_sub<T>(
} }
impl<'a, 'tcx> InferCtxt<'a, 'tcx> { impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
/// Replaces all regions (resp. types) bound by `binder` with placeholder /// Replaces all bound variables (lifetimes, types, and constants) bound by
/// regions (resp. types) and return a map indicating which bound-region /// `binder` with placeholder variables.
/// placeholder region. This is the first step of checking subtyping
/// when higher-ranked things are involved.
/// ///
/// **Important:** You have to be careful to not leak these placeholders, /// This is the first step of checking subtyping when higher-ranked things are involved.
/// for more information about how placeholders and HRTBs work, see /// For more details visit the relevant sections of the [rustc dev guide].
/// the [rustc dev guide].
/// ///
/// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/traits/hrtb.html
pub fn replace_bound_vars_with_placeholders<T>(&self, binder: ty::Binder<'tcx, T>) -> T pub fn replace_bound_vars_with_placeholders<T>(&self, binder: ty::Binder<'tcx, T>) -> T