linux-kernel - Re: [PATCH v1 05/28] rust: macros: add `concat

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Date:   Mon, 14 Nov 2022 14:39:26 +0000
From:   Björn Roy Baron <bjorn3_gh@...tonmail.com>
To:     Gary Guo <gary@...yguo.net>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev
Subject: Re: [PATCH v1 05/28] rust: macros: add `concat_idents!` proc macro

On Monday, November 14th, 2022 at 15:26, Gary Guo <gary@...yguo.net> wrote:


> On Thu, 10 Nov 2022 17:41:17 +0100
> Miguel Ojeda ojeda@...nel.org wrote:
> 
> > +pub(crate) fn concat_idents(ts: TokenStream) -> TokenStream {
> > + let mut it = ts.into_iter();
> > + let a = expect_ident(&mut it);
> > + assert_eq!(expect_punct(&mut it), ',');
> > + let b = expect_ident(&mut it);
> > + assert!(it.next().is_none(), "only two idents can be concatenated");
> > + let res = Ident::new(&(a.to_string() + &b.to_string()), b.span());
> 
> 
> Probably clearer to write `Ident::new(&format!("{a}{b}"), b.span())`
> here?
> 
> Best,
> Gary

I agree that is clearer. I hadn't considered that Ident implements Display when I wrote it.

Cheers,
Björn