mirror of https://github.com/rust-lang/rust
50 lines
2.1 KiB
Plaintext
50 lines
2.1 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:32:5
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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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LL | / establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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LL | |
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LL | |
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LL | | // Only works if 'x: 'y:
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LL | | demand_y(x, y, x.get())
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LL | | });
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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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= note: requirement occurs because of the type `Cell<&'?9 u32>`, which makes the generic argument `&'?9 u32` invariant
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= note: the struct `Cell<T>` is invariant over the parameter `T`
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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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