Auto merge of #27045 - nikomatsakis:better-object-defaults-error, r=pnkfelix

Transition to the new object lifetime defaults, replacing the old defaults completely.

r? @pnkfelix 

This is a [breaking-change] as specified by [RFC 1156][1156] (though all cases that would break should have been receiving warnings starting in Rust 1.2). Types like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from being interpreted as `&'a Box<Trait+'a>` to `&'a Box<Trait+'static>`. To restore the old behavior, write the `+'a` explicitly. For example, the function:


```rust
trait Trait { }
fn foo(x: &Box<Trait>) { ... }
```

would be rewritten as:

```rust
trait Trait { }
fn foo(x: &'a Box<Trait+'a>) { ... }
```

if one wanted to preserve the current typing.

[1156]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md

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