src/librustc_typeck/check/assoc.rs

   1 // Copyright 2014 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.
   4 //
   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.
  10
  11 use middle::infer::InferCtxt;
  12 use middle::traits::{self, FulfillmentContext, Normalized, MiscObligation,
  13                      SelectionContext, ObligationCause};
  14 use middle::ty::{self, HasProjectionTypes};
  15 use middle::ty_fold::{TypeFoldable, TypeFolder};
  16 use syntax::ast;
  17 use syntax::codemap::Span;
  18 use util::ppaux::Repr;
  19
  20 pub fn normalize_associated_types_in<'a,'tcx,T>(infcx: &InferCtxt<'a,'tcx>,
  21                                                 typer: &(ty::ClosureTyper<'tcx>+'a),
  22                                                 fulfillment_cx: &mut FulfillmentContext<'tcx>,
  23                                                 span: Span,
  24                                                 body_id: ast::NodeId,
  25                                                 value: &T)
  26                                                 -> T
  27     where T : TypeFoldable<'tcx> + HasProjectionTypes + Clone + Repr<'tcx>
  28 {
  29     debug!("normalize_associated_types_in(value={})", value.repr(infcx.tcx));
  30     let mut selcx = SelectionContext::new(infcx, typer);
  31     let cause = ObligationCause::new(span, body_id, MiscObligation);
  32     let Normalized { value: result, obligations } = traits::normalize(&mut selcx, cause, value);
  33     debug!("normalize_associated_types_in: result={} predicates={}",
  34            result.repr(infcx.tcx),
  35            obligations.repr(infcx.tcx));
  36     for obligation in obligations {
  37         fulfillment_cx.register_predicate_obligation(infcx, obligation);
  38     }
  39     result
  40 }