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Fix mis-uses of projection mode #32344

Merged
merged 1 commit into from
Mar 21, 2016
Merged

Fix mis-uses of projection mode #32344

merged 1 commit into from
Mar 21, 2016

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aturon
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@aturon aturon commented Mar 19, 2016

A couple of places where we construct a fresh inference context were
incorrectly assuming that we were past coherence checking. This commit
corrects them to use Topmost rather than AnyFinal as the projection mode.

Fixes #32324

r? @nikomatsakis

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aturon commented Mar 19, 2016

It's pretty unfortunate to have this as a source of bugs. I did a quick audit of uses of AnyFinal and the rest seem quite clearly post-coherence. But I suspect we'll continue to see ICEs in this area until we remove the phase split around specialization graph construction.

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sanxiyn commented Mar 20, 2016

Travis shows failure for the added test.

failures:
    [run-pass] run-pass/issue-32324.rs

A couple of places where we construct a fresh inference context were
incorrectly assuming that we were past coherence checking. This commit
corrects them to use `Topmost` rather than `AnyFinal` as the projection mode.

Fixes rust-lang#32324
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aturon commented Mar 20, 2016

Test fixed. Just needs a review.

cc @eddyb if you feel like snipe-reviewing :)

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eddyb commented Mar 20, 2016

@aturon I still think the names are non-obvious, but the diff is tiny and LGTM.

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aturon commented Mar 20, 2016

@eddyb Yep, happy to try to improve the names separately (if we can come up with something good).

@bors: r=eddyb

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bors commented Mar 20, 2016

📌 Commit 09263a6 has been approved by eddyb

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bors commented Mar 21, 2016

⌛ Testing commit 09263a6 with merge 7f5c568...

bors added a commit that referenced this pull request Mar 21, 2016
Fix mis-uses of projection mode

A couple of places where we construct a fresh inference context were
incorrectly assuming that we were past coherence checking. This commit
corrects them to use `Topmost` rather than `AnyFinal` as the projection mode.

Fixes #32324

r? @nikomatsakis
@bors bors merged commit 09263a6 into rust-lang:master Mar 21, 2016
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5 participants