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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::TokenStream;
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#[proc_macro_derive(A)]
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pub fn derive(input: TokenStream) -> TokenStream {
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let input = input.to_string();
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assert!(input.contains("struct A;"));
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"struct B;".parse().unwrap()
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}
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