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Diffstat (limited to 'tests/ui/proc-macro/auxiliary/first-second.rs')
-rw-r--r-- | tests/ui/proc-macro/auxiliary/first-second.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/auxiliary/first-second.rs b/tests/ui/proc-macro/auxiliary/first-second.rs new file mode 100644 index 000000000..6331608fb --- /dev/null +++ b/tests/ui/proc-macro/auxiliary/first-second.rs @@ -0,0 +1,20 @@ +// force-host +// no-prefer-dynamic + +#![crate_type = "proc-macro"] + +extern crate proc_macro; + +use proc_macro::{TokenStream, TokenTree, Group, Delimiter}; + +#[proc_macro_attribute] +pub fn first(_attr: TokenStream, item: TokenStream) -> TokenStream { + let tokens: TokenStream = "#[derive(Second)]".parse().unwrap(); + let wrapped = TokenTree::Group(Group::new(Delimiter::None, item.into_iter().collect())); + tokens.into_iter().chain(std::iter::once(wrapped)).collect() +} + +#[proc_macro_derive(Second)] +pub fn second(item: TokenStream) -> TokenStream { + TokenStream::new() +} |