720b6941df
Prefer regions with an `external_name` in `approx_universal_upper_bound` Fixes #75785 When displaying a MIR borrowcheck error, we may need to find an upper bound for a region, which gives us a region to point to in the error message. However, a region might outlive multiple distinct universal regions, in which case the only upper bound is 'static To try to display a meaningful error message, we compute an 'approximate' upper bound by picking one of the universal regions. Currently, we pick the region with the lowest index - however, this caused us to produce a suboptimal error message in issue #75785 This PR `approx_universal_upper_bound` to prefer regions with an `external_name`. This causes us to prefer regions from function arguments/upvars, which seems to lead to a nicer error message in some cases. |
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| .. | ||
| borrow_check | ||
| const_eval | ||
| dataflow | ||
| interpret | ||
| monomorphize | ||
| transform | ||
| util | ||
| lib.rs | ||
| shim.rs | ||