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useful debug

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This commit is contained in:
Niko Matsakis 2019-07-12 06:31:42 -04:00 • committed by Alexander Regueiro
parent 63a67a076f
commit e0712c898e
1 changed files with 14 additions and 0 deletions
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14
src/librustc_typeck/astconv.rs
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@ -1496,7 +1496,17 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
{
let tcx = self.tcx();
debug!(
"find_bound_for_assoc_item(ty_param_def_id={:?}, assoc_name={:?}, span={:?})",
ty_param_def_id,
assoc_name,
span,
);
let predicates = &self.get_type_parameter_bounds(span, ty_param_def_id).predicates;
debug!("find_bound_for_assoc_item: predicates={:#?}", predicates);
let bounds = predicates.iter().filter_map(|(p, _)| p.to_opt_poly_trait_ref());
// Check that there is exactly one way to find an associated type with the
@ -1535,7 +1545,11 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
}
};
debug!("one_bound_for_assoc_type: bound = {:?}", bound);
if let Some(bound2) = bounds.next() {
debug!("one_bound_for_assoc_type: bound2 = {:?}", bound2);
let bounds = iter::once(bound).chain(iter::once(bound2)).chain(bounds);
let mut err = struct_span_err!(
self.tcx().sess, span, E0221,