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Niko Matsakis 2018-02-27 17:36:33 -05:00 committed by leonardo.yvens
parent a7c7c8a4d7
commit c84b7815b3
1 changed files with 3 additions and 0 deletions
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src/librustc_typeck/check/wfcheck.rs
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@ -370,6 +370,9 @@ impl<'a, 'gcx> CheckTypeWellFormedVisitor<'a, 'gcx> {
// Here the default `Vec<[u32]>` is not WF because `[u32]: Sized` does not hold. // Here the default `Vec<[u32]>` is not WF because `[u32]: Sized` does not hold.
for d in generics.types.iter().cloned().filter(is_our_default).map(|p| p.def_id) { for d in generics.types.iter().cloned().filter(is_our_default).map(|p| p.def_id) {
let ty = fcx.tcx.type_of(d); let ty = fcx.tcx.type_of(d);
// ignore dependent defaults -- that is, where the default of one type
// parameter includes another (e.g., <T, U = T>). In those cases, we can't
// be sure if it will error or not as user might always specify the other.
if !ty.needs_subst() { if !ty.needs_subst() {
fcx.register_wf_obligation(ty, fcx.tcx.def_span(d), self.code.clone()); fcx.register_wf_obligation(ty, fcx.tcx.def_span(d), self.code.clone());
} }