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223f0c8684
There was a mismatch between a `self.macro_context_level += 1` and the corresponding `self.macro_context_level -= 1`, which resulted in an `usize` underflow (panic in debug mode, wrong behaviour in release mode). This fixes it and adds a relevant assertion and test. In order to properly test library mode extraction, a special option enforcing that on source code as well is added.
15 lines
395 B
Rust
15 lines
395 B
Rust
use proc_macro::TokenStream;
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use quote::quote;
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#[proc_macro_attribute]
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pub fn add_one(_attr: TokenStream, item: TokenStream) -> TokenStream {
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let ast = syn::parse_macro_input!(item as syn::ItemFn);
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let mut new_ast = ast.clone();
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new_ast.sig.ident = syn::Ident::new(&format!("{}_new", ast.sig.ident), ast.sig.ident.span());
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quote! {
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#ast
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#new_ast
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}.into()
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}
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