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rust/src/librustc/middle
Manish Goregaokar b20f427391 Rollup merge of #30368 - arielb1:region-unification-2, r=nikomatsakis
Turns out that calling `resolve_type_variables_if_possible` in a O(n^2)
loop is a bad idea. Now we just resolve each copy of the region variable
to its lowest name each time (we resolve the region variable to its lowest
name, rather than to its unify-table name to avoid the risk of
the unify-table name changing infinitely many times. That may be
not a problem in practice, but I am not sure of it).
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