Propagate Expectation around binop typeck code to construct more precise trait obligations for binops.

compiler/rustc_middle/src/traits/mod.rs

@@ -12,7 +12,7 @@ pub mod util;
 use crate::infer::canonical::Canonical;
 use crate::ty::abstract_const::NotConstEvaluatable;
 use crate::ty::subst::SubstsRef;
-use crate::ty::{self, AdtKind, Ty, TyCtxt};
+use crate::ty::{self, AdtKind, Predicate, Ty, TyCtxt};
 
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Applicability, Diagnostic};
@@ -414,6 +414,7 @@ pub enum ObligationCauseCode<'tcx> {
     BinOp {
         rhs_span: Option<Span>,
         is_lit: bool,
+        output_pred: Option<Predicate<'tcx>>,
     },
 }