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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.
49 lines
1.5 KiB
Rust
49 lines
1.5 KiB
Rust
//@ check-fail
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trait Trait<'a> {}
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fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
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x as _ //~ error: lifetime may not live long enough
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//~| error: lifetime may not live long enough
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}
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fn change_lt_ab<'a: 'b, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
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x as _ //~ error: lifetime may not live long enough
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}
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fn change_lt_ba<'a, 'b: 'a>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> {
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x as _ //~ error: lifetime may not live long enough
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}
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fn change_lt_hr<'a>(x: *mut dyn Trait<'a>) -> *mut dyn for<'b> Trait<'b> {
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x as _ //~ error: lifetime may not live long enough
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//~^ error: mismatched types
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//~| one type is more general than the other
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}
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trait Assocked {
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type Assoc: ?Sized;
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}
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fn change_assoc_0<'a, 'b>(
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x: *mut dyn Assocked<Assoc = dyn Send + 'a>,
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) -> *mut dyn Assocked<Assoc = dyn Send + 'b> {
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x as _ //~ error: lifetime may not live long enough
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//~| error: lifetime may not live long enough
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}
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fn change_assoc_1<'a, 'b>(
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x: *mut dyn Assocked<Assoc = dyn Trait<'a>>,
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) -> *mut dyn Assocked<Assoc = dyn Trait<'b>> {
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x as _ //~ error: lifetime may not live long enough
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//~| error: lifetime may not live long enough
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}
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// This tests the default borrow check error, without the special casing for return values.
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fn require_static(_: *const dyn Trait<'static>) {}
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fn extend_to_static<'a>(ptr: *const dyn Trait<'a>) {
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require_static(ptr as _) //~ error: borrowed data escapes outside of function
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}
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fn main() {}
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