clippy::nonstandard_macro_braces

[jbr]

Hi! recently, the following warning started showing up on nightly clippy:

warning: use of irregular braces for `write!` macro
  --> example/src/main.rs:14:10
   |
14 | #[derive(Template)]
   |          ^^^^^^^^
   |
   = note: `#[warn(clippy::nonstandard_macro_braces)]` on by default
help: consider writing `Template`
  --> example/src/main.rs:14:10
   |
14 | #[derive(Template)]
   |          ^^^^^^^^
   = 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 `Template` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 1 warning emitted

Running RUSTFLAGS="-Z macro-backtrace" cargo clippy -Z unstable-options results in

warning: use of irregular braces for `write!` macro
  --> aws-lambda-example/src/main.rs:10:10
   |
10 | #[derive(Template)]
   |          ^^^^^^^^ in this macro invocation
   |
  ::: /Users/jbr/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/askama_derive-0.10.5/src/lib.rs:16:1
   |
16 | pub fn derive_template(input: TokenStream) -> TokenStream {
   | --------------------------------------------------------- in this expansion of procedural macro `#[derive(Template)]`
   |
   = note: `#[warn(clippy::nonstandard_macro_braces)]` on by default
help: consider writing `Template`
  --> aws-lambda-example/src/main.rs:10:10
   |
10 | #[derive(Template)]
   |          ^^^^^^^^ in this macro invocation
   |
  ::: /Users/jbr/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/askama_derive-0.10.5/src/lib.rs:16:1
   |
16 | pub fn derive_template(input: TokenStream) -> TokenStream {
   | --------------------------------------------------------- in this expansion of procedural macro `#[derive(Template)]`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonstandard_macro_braces

warning: 1 warning emitted

which isn't particularly helpful, but somewhere in askama-derive there's a nonstandard brace for write!

[Kijewski]

This warning was caused by an error in clippy itself: rust-lang/rust-clippy#7431. Please try if rustup update fixes the problem for you.

[jbr]

This doesn't seem to be resolved yet, but maybe in another day or two?

❯ cargo clippy --version
clippy 0.1.55 (88539999 2021-07-06)

❯ rustup check
stable-x86_64-apple-darwin - Up to date : 1.53.0 (53cb7b09b 2021-06-17)
nightly-x86_64-apple-darwin - Up to date : 1.55.0-nightly (885399992 2021-07-06)

[jbr]

Looks like this might take up to a week to show as resolved but is certainly not an askama issue, so am closing this

rust-lang/rust-clippy#7434 (comment)