Clippy warnings after upgrade to 0.7

[bemyak]

After upgrading to 0.7 Clippy complains about all precedence rules:

    rule full_expression() -> Expression
      = precedence!{
        // omitted
        --
        _ n:operand() _ { Expression::Value(n) }
        "(" _ e:full_expression() _ ")" { e }
      }

error:

warning: try not to call a closure in the expression where it is declared
   --> src/format/roll.rs:330:41
    |
330 |         "(" _ e:full_expression() _ ")" { e }
    |                                         ^^^^^ help: try doing something like: `{ e }`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure_call

🤷

[kevinmehall]

0.7 wraps code blocks in immediately-invoked closures to control the behavior of return and ?: #248

[bemyak]

I see. Since it's not a bug and doesn't have any performance impact, maybe it would be fine to just suppress this warning with

#![allow(clippy::redundant_closure_call)]

?