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When truncating a goal, don't truncate the environment #294

Merged
merged 2 commits into from Dec 9, 2019
Merged

When truncating a goal, don't truncate the environment #294

merged 2 commits into from Dec 9, 2019

Commits on Nov 22, 2019

  1. When truncating a goal, don't truncate the environment

    @jackh726
    jackh726 committed Nov 22, 2019
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Commits on Dec 9, 2019

  1. add regression test for rust-lang#280 

    This test dies with an overflow. With CHALK_DEBUG=1 this death is
quick, without it, it is slow and painful. The problem is that some of
the types in the environment are "truncated" and replaced with
inference variables, but those types are unnormalized
projections. When we then go to unify the environment found in the
answer, we end up needing to unify inference variables with
unnormalized projections -- but the current code creates subgoals
instead, which leads to an infinite recursion.
    @nikomatsakis
    nikomatsakis authored and Nicholas Matsakis committed Dec 9, 2019
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