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make try_find_coercion_lub private; we always use CoerceMany

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This commit is contained in:
Niko Matsakis 2017-03-17 11:53:15 -04:00
parent cecccd9bef
commit 52e524a357
1 changed files with 10 additions and 7 deletions
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17
src/librustc_typeck/check/coercion.rs
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@ -715,13 +715,16 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
/// Given some expressions, their known unified type and another expression,
/// tries to unify the types, potentially inserting coercions on any of the
/// provided expressions and returns their LUB (aka "common supertype").
pub fn try_find_coercion_lub<'b, E, I>(&self,
cause: &ObligationCause<'tcx>,
exprs: E,
prev_ty: Ty<'tcx>,
new: &'b hir::Expr,
new_ty: Ty<'tcx>)
-> RelateResult<'tcx, Ty<'tcx>>
///
/// This is really an internal helper. From outside the coercion
/// module, you should instantiate a `CoerceMany` instance.
fn try_find_coercion_lub<'b, E, I>(&self,
cause: &ObligationCause<'tcx>,
exprs: E,
prev_ty: Ty<'tcx>,
new: &'b hir::Expr,
new_ty: Ty<'tcx>)
-> RelateResult<'tcx, Ty<'tcx>>
where E: Fn() -> I,
I: IntoIterator<Item = &'b hir::Expr>
{