1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Module for inferring the variance of type and lifetime
12 //! parameters. See README.md for details.
15 use rustc::ty::TyCtxt;
17 /// Defines the `TermsContext` basically houses an arena where we can
21 /// Code to gather up constraints.
24 /// Code to solve constraints and write out the results.
27 /// Code for transforming variances.
30 pub fn infer_variance<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
31 let mut arena = arena::TypedArena::new();
32 let terms_cx = terms::determine_parameters_to_be_inferred(tcx, &mut arena);
33 let constraints_cx = constraints::add_constraints_from_crate(terms_cx);
34 solve::solve_constraints(constraints_cx);
35 tcx.variance_computed.set(true);