bors a416c5e0f7 Auto merge of #3545 - Kampfkarren:vec_boxed_sized, r=flip1995
Adds lint for Vec<Box<T: Sized>>

This adds, and subsequently closes #3530. This is the first time I've ever worked with anything remotely close to internal Rust code, so I'm very much unsure about the if_chain! to figure this out!

I can't get rustfmt working on WSL with nightly 2018-12-07:

`error: component 'rustfmt' for target 'x86_64-unknown-linux-gnu' is unavailable for download`
2018-12-14 12:10:48 +00:00
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