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error[E0521]: borrowed data escapes outside of function
--> $DIR/region-invariant-static-error-reporting.rs:14:9
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LL | fn unify<'a>(x: Option<Invariant<'a>>, f: fn(Invariant<'a>)) {
| -- - `x` is a reference that is only valid in the function body
| |
| lifetime `'a` defined here
LL | let bad = if x.is_some() {
LL | x.unwrap()
| ^^^^^^^^^^
| |
| `x` escapes the function body here
| argument requires that `'a` must outlive `'static`
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= note: requirement occurs because of the type `Invariant<'_>`, which makes the generic argument `'_` invariant
= note: the struct `Invariant<'a>` is invariant over the parameter `'a`
= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
error: aborting due to previous error
For more information about this error, try `rustc --explain E0521`.
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