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spanr
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Procedural macro span debugger/visualizer
Download README (.md)
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Download README
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README.md
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spanr
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# spanr A tool for procedural macro authors to be able to interactively view and debug the `Span`s on generated code. ## Screenshot  ## Example usage ```rust #[proc_macro_attribute] pub fn act_zero(_attr: TokenStream, item: TokenStream) -> TokenStream { let res = match act_zero_impl(item) { Ok(tokens) => tokens, Err(e) => e.to_compile_error(), }; // Save the visualization to a file spanr::save_html(res.clone(), "tokens.html").unwrap(); res.into() } ``` ## Building This crate relies on unstable features from the `proc-macro2` crate, so it must be built using a nightly compiler, and the `RUSTFLAGS` environment variable must be configured: ```bash RUSTFLAGS='--cfg procmacro2_semver_exempt' ```
