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The SCCs of the region graph are not a reliable heuristic to use for blaming an interesting constraint for diagnostics. For region errors, if the outlived region is `'static`, or the involved types are invariant in their lifetiems, there will be cycles in the constraint graph containing both the target region and the most interesting constraints to blame. To get better diagnostics in these cases, this commit removes that heuristic.
20 lines
906 B
Plaintext
20 lines
906 B
Plaintext
error[E0521]: borrowed data escapes outside of closure
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--> $DIR/issue-7573.rs:17:9
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LL | let mut lines_to_use: Vec<&CrateId> = Vec::new();
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| ---------------- `lines_to_use` declared here, outside of the closure body
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LL |
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LL | let push_id = |installed_id: &CrateId| {
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| ------------ `installed_id` is a reference that is only valid in the closure body
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LL |
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LL | lines_to_use.push(installed_id);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `installed_id` escapes the closure body here
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= note: requirement occurs because of a mutable reference to `Vec<&CrateId>`
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= note: mutable references are invariant over their type parameter
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= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0521`.
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