ac922245f0
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.
42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
note: external requirements
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--> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:32:47
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LL | establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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| ^^^^^^^^^^^^^^^^^
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= note: defining type: supply::{closure#0} with closure args [
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i16,
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for<Region(BrAnon), Region(BrAnon), Region(BrAnon), Region(BrAnon), Region(BrAnon)> extern "rust-call" fn((&'^0 std::cell::Cell<&'?1 &'^1 u32>, &'^2 std::cell::Cell<&'^1 u32>, &'^3 std::cell::Cell<&'^4 u32>)),
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(),
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]
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= note: late-bound region is '?2
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= note: late-bound region is '?3
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= note: number of external vids: 4
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= note: where '?1: '?0
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note: no external requirements
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--> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:31:1
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LL | fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: defining type: supply
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error[E0521]: borrowed data escapes outside of function
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--> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:34:9
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LL | fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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| -- ------ `cell_a` is a reference that is only valid in the function body
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| |
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| lifetime `'a` defined here
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...
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LL | demand_y(x, y, x.get())
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| ^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| `cell_a` escapes the function body here
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| argument requires that `'a` must outlive `'static`
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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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