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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/proc-macro/auxiliary/duplicate.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/proc-macro/auxiliary/duplicate.rs')
-rw-r--r-- | src/test/ui/proc-macro/auxiliary/duplicate.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/auxiliary/duplicate.rs b/src/test/ui/proc-macro/auxiliary/duplicate.rs new file mode 100644 index 000000000..b8f82b46f --- /dev/null +++ b/src/test/ui/proc-macro/auxiliary/duplicate.rs @@ -0,0 +1,32 @@ +// force-host +// no-prefer-dynamic + +#![deny(unused)] +#![crate_type = "proc-macro"] + +extern crate proc_macro; +use proc_macro::*; + +#[proc_macro_attribute] +pub fn duplicate(attr: TokenStream, item: TokenStream) -> TokenStream { + let mut new_name = Some(attr.into_iter().nth(0).unwrap()); + let mut encountered_idents = 0; + let input = item.to_string(); + let ret = item + .into_iter() + .map(move |token| match token { + TokenTree::Ident(_) if encountered_idents == 1 => { + encountered_idents += 1; + new_name.take().unwrap() + } + TokenTree::Ident(_) => { + encountered_idents += 1; + token + } + _ => token, + }) + .collect::<TokenStream>(); + let mut input_again = input.parse::<TokenStream>().unwrap(); + input_again.extend(ret); + input_again +} |