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Forbid duplicate supertraits

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I actually already pushed most of this by accident before I meant to, but
r=nmatsakis anyway.

Closes #3953
This commit is contained in:
Tim Chevalier 2012-11-16 15:12:14 -08:00
parent 5005be67cc
commit 428c58b9f9
1 changed files with 1 additions and 1 deletions
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src/librustc/middle/typeck/collect.rs
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@ -264,7 +264,7 @@ fn ensure_supertraits(ccx: @crate_ctxt,
for trait_refs.each |trait_ref| {
let (did, tpt) = instantiate_trait_ref(ccx, *trait_ref, rp);
if instantiated.any(|other_trait: &InstantiatedTraitRef|
{ (*other_trait).def_id == did }) {
{ other_trait.def_id == did }) {
// This means a trait inherited from the same supertrait more
// than once.
tcx.sess.span_err(sp, ~"Duplicate supertrait in trait \