Tracking issue for Pattern Guards with Bind-By-Move

[alexcrichton]

Tracking issue for "Pattern Guards with Bind-By-Move" (rust-lang/rfcs#107)

Steps:

• Implement the RFC (already done as part of NLL work)
• Adjust documentation (see instructions on forge)
• Stabilization PR (see instructions on forge)

[steveklabnik]

Triage: this has still not been implemented

[jonhoo]

I keep running into this (or rather, the simpler #14252) in places where I now end up with an extra level of indentation:

match x {
    Foo(v) => if do_a {
            // ...
        } else if do_b {
            // ...
        } else if do_c {
            // ...
        } else {
            // ...
        }
}

when it could be

match x {
    Foo(v) if do_a => {
        // ...
    },
    Foo(v) if do_b => {
        // ...
    },
    Foo(v) if do_c => {
        // ...
    },
    Foo(v) => {
        // ...
  }
}