clippy warning nonstandard_macro_braces about derive(FromSql)

[caudate-julie]

The following code:

// [dependencies]
// postgres-types = { version = "0.2.1", features = ["derive"] }

#[derive(postgres_types::FromSql)]
enum Example {
    Hello,
    World
}

gives a clippy warning:

warning: use of irregular braces for `format!` macro
 --> src\main.rs:1:10
  |
1 | #[derive(postgres_types::FromSql)]
  |          ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(clippy::nonstandard_macro_braces)]` on by default
help: consider writing `postgres_types::FromSql`
 --> src\main.rs:1:10
  |
1 | #[derive(postgres_types::FromSql)]
  |          ^^^^^^^^^^^^^^^^^^^^^^^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonstandard_macro_braces
  = note: this warning originates in the derive macro `postgres_types::FromSql` (in Nightly builds, run with -Z macro-backtrace for more info)

[sfackler]

This seems like a bug in clippy.