mirror of https://github.com/rust-lang/rust
44 lines
1.8 KiB
Plaintext
44 lines
1.8 KiB
Plaintext
error[E0308]: mismatched types
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--> $DIR/region-multiple-lifetime-bounds-on-fns-where-clause.rs:22:56
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LL | let _: fn(&mut &isize, &mut &isize, &mut &isize) = a;
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| ----------------------------------------- ^ one type is more general than the other
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| expected due to this
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= note: expected fn pointer `for<'a, 'b, 'c, 'd, 'e, 'f> fn(&'a mut &'b _, &'c mut &'d _, &'e mut &'f _)`
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found fn item `for<'a, 'b, 'c> fn(&'a mut &_, &'b mut &_, &'c mut &_) {a::<'_, '_, '_>}`
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error: lifetime may not live long enough
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--> $DIR/region-multiple-lifetime-bounds-on-fns-where-clause.rs:9:5
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LL | fn b<'a, 'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) {
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| -- -- lifetime `'b` defined here
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| |
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| lifetime `'a` defined here
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LL | // Illegal now because there is no `'b:'a` declaration.
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LL | *x = *y;
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| ^^^^^^^ assignment requires that `'b` must outlive `'a`
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= help: consider adding the following bound: `'b: 'a`
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error: lifetime may not live long enough
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--> $DIR/region-multiple-lifetime-bounds-on-fns-where-clause.rs:16:5
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LL | fn c<'a,'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) {
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| -- -- lifetime `'b` defined here
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| |
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| lifetime `'a` defined here
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...
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LL | a(x, y, z);
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| ^^^^^^^^^^ argument requires that `'b` must outlive `'a`
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= help: consider adding the following bound: `'b: 'a`
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= note: requirement occurs because of a mutable reference to `&isize`
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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 3 previous errors
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For more information about this error, try `rustc --explain E0308`.
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