I'm trying to debug spans in a procedural macro. -Zunpretty=expanded doesn't show span information. Is there an easy way to see what spans are attached to tokens?
Assuming you're using proc_macro2 which is alternative to the compiler's proc_macro crate, a TokenStream can be converted into an iterator over TokenTrees from which you can access the span. Note that for methods like token_tree.span().start() to be meaningful, you'll need to compile with the span-locations feature and use the nightly toolchain.
Here's a related reply I made in a separate thread for additional context.
Thanks, that works for me. Is there no option in rustc to dump that information then?
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