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+// edition:2018
+// build-pass (FIXME(62277): could be check-pass?)
+
+trait Trait<'a, 'b> {}
+impl<T> Trait<'_, '_> for T {}
+
+// `Ordinary<'a> <: Ordinary<'b>` if `'a: 'b`, as with most types.
+//
+// I am purposefully avoiding the terms co- and contra-variant because
+// their application to regions depends on how you interpreted Rust
+// regions. -nikomatsakis
+struct Ordinary<'a>(&'a u8);
+
+// Here we wind up selecting `'e` in the hidden type because
+// we need something outlived by both `'a` and `'b` and only `'e` applies.
+
+fn upper_bounds<'a, 'b, 'c, 'd, 'e>(a: Ordinary<'a>, b: Ordinary<'b>) -> impl Trait<'d, 'e>
+where
+ 'a: 'e,
+ 'b: 'e,
+ 'a: 'd,
+{
+ // We return a value:
+ //
+ // ```
+ // 'a: '0
+ // 'b: '1
+ // '0 in ['d, 'e]
+ // ```
+ //
+ // but we don't have it.
+ //
+ // We are forced to pick that '0 = 'e, because only 'e is outlived by *both* 'a and 'b.
+ let p = if condition() { a } else { b };
+ p
+}
+
+fn condition() -> bool {
+ true
+}
+
+fn main() {}