bjoernager/rust
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Move some outlives bounds things from rustc_trait_selection to rustc_typeck

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This commit is contained in:
jackh726 2021-10-15 11:31:22 -04:00
parent d3fa07c72e
commit 2b5b456e23
7 changed files with 55 additions and 59 deletions
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49
compiler/rustc_trait_selection/src/infer.rs
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@ -1,12 +1,8 @@
use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
use crate::traits::query::outlives_bounds::InferCtxtExt as _;
use crate::traits::{self, TraitEngine, TraitEngineExt};
use rustc_data_structures::stable_set::FxHashSet;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::lang_items::LangItem;
use rustc_infer::infer::outlives::env::OutlivesEnvironment;
use rustc_infer::traits::ObligationCause;
use rustc_middle::arena::ArenaAllocatable;
use rustc_middle::infer::canonical::{Canonical, CanonicalizedQueryResponse, QueryResponse};
@ -180,48 +176,3 @@ impl<'tcx> InferCtxtBuilderExt<'tcx> for InferCtxtBuilder<'tcx> {
)
}
}
pub trait OutlivesEnvironmentExt<'tcx> {
fn add_implied_bounds(
&mut self,
infcx: &InferCtxt<'a, 'tcx>,
fn_sig_tys: FxHashSet<Ty<'tcx>>,
body_id: hir::HirId,
span: Span,
);
}
impl<'tcx> OutlivesEnvironmentExt<'tcx> for OutlivesEnvironment<'tcx> {
/// This method adds "implied bounds" into the outlives environment.
/// Implied bounds are outlives relationships that we can deduce
/// on the basis that certain types must be well-formed -- these are
/// either the types that appear in the function signature or else
/// the input types to an impl. For example, if you have a function
/// like
///
/// ```
/// fn foo<'a, 'b, T>(x: &'a &'b [T]) { }
/// ```
///
/// we can assume in the caller's body that `'b: 'a` and that `T:
/// 'b` (and hence, transitively, that `T: 'a`). This method would
/// add those assumptions into the outlives-environment.
///
/// Tests: `src/test/ui/regions/regions-free-region-ordering-*.rs`
fn add_implied_bounds(
&mut self,
infcx: &InferCtxt<'a, 'tcx>,
fn_sig_tys: FxHashSet<Ty<'tcx>>,
body_id: hir::HirId,
span: Span,
) {
debug!("add_implied_bounds()");
for ty in fn_sig_tys {
let ty = infcx.resolve_vars_if_possible(ty);
debug!("add_implied_bounds: ty = {}", ty);
let implied_bounds = infcx.implied_outlives_bounds(self.param_env, body_id, ty, span);
self.add_outlives_bounds(Some(infcx), implied_bounds)
}
}
}