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https://github.com/rust-lang/rust.git
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Aaron Hill
93ab12eeab
This PR has several interconnected pieces: 1. In some of the NLL region error code, we now pass around an `ObligationCause`, instead of just a plain `Span`. This gets forwarded into `fulfill_cx.register_predicate_obligation` during error reporting. 2. The general InferCtxt error reporting code is extended to handle `ObligationCauseCode::BindingObligation` 3. A new enum variant `ConstraintCategory::Predicate` is added. We try to avoid using this as the 'best blame constraint' - instead, we use it to enhance the `ObligationCause` of the `BlameConstraint` that we do end up choosing. As a result, several NLL error messages now contain the same "the lifetime requirement is introduced here" message as non-NLL errors. Having an `ObligationCause` available will likely prove useful for future improvements to NLL error messages.
35 lines
914 B
Rust
35 lines
914 B
Rust
//! New recursive solver modeled on Chalk's recursive solver. Most of
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//! the guts are broken up into modules; see the comments in those modules.
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#![feature(crate_visibility_modifier)]
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#![feature(in_band_lifetimes)]
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#![feature(nll)]
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#![recursion_limit = "256"]
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#[macro_use]
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extern crate tracing;
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#[macro_use]
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extern crate rustc_middle;
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mod chalk;
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mod dropck_outlives;
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mod evaluate_obligation;
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mod implied_outlives_bounds;
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mod normalize_erasing_regions;
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mod normalize_projection_ty;
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mod type_op;
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pub use type_op::{type_op_ascribe_user_type_with_span, type_op_prove_predicate_with_cause};
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use rustc_middle::ty::query::Providers;
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pub fn provide(p: &mut Providers) {
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dropck_outlives::provide(p);
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evaluate_obligation::provide(p);
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implied_outlives_bounds::provide(p);
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chalk::provide(p);
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normalize_projection_ty::provide(p);
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normalize_erasing_regions::provide(p);
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type_op::provide(p);
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}
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