Fix region erasure issue #20582 #20707
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`ty_fold::erase_regions`; also erase regions whenever we normalize associated types.
…ssing the debruijn index in so that callees could construct late-bound regions at the right depth, but then the result was cached. When the cached result was used, it might be at the wrong depth. So now we don't pass the result in and instead simply adjust the depth to match the current nesting level as we go.
caused me quite a bit of hair-pulling.
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r? @nick29581 (rust_highfive has picked a reviewer for you, use r? to override) |
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Fix an associated type ICE (#20582)