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Update procedural-macros.md adding context for use of `extern crate p… #1504

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Update procedural-macros.md adding context for use of `extern crate p…
mav3ri3k May 29, 2024
74354c4
Patch for failing test: lines must end with spaces
mav3ri3k May 29, 2024
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5 changes: 5 additions & 0 deletions src/procedural-macros.md
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Expand Up @@ -21,6 +21,11 @@ Procedural macros must be defined in a crate with the [crate type] of
> [lib]
> proc-macro = true
> ```
>
> This will automatically links to the compiler-provided [proc_macro](https://doc.rust-lang.org/proc_macro/index.html) crate.
> `extern crate proc_macro;` would be needed if you want to support releases
> older than Rust 2018, or if using another build tool that does not pass the
> appropriate `--extern` flags to rustc.

As functions, they must either return syntax, panic, or loop endlessly. Returned
syntax either replaces or adds the syntax depending on the kind of procedural
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