{
  "$type": "site.standard.document",
  "bskyPostRef": {
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    "uri": "at://did:plc:ivbknywyskln22er3nkssdhl/app.bsky.feed.post/3mo7cbzi4lto2"
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  "path": "/t/why-cant-pat-param-be-followed-by-a-colon-in-macro-rules/24394#post_4",
  "publishedAt": "2026-06-13T22:20:45.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "I would also like it if we _didn't_ lift this restriction, because I'd like to reuse top-level pattern type ascription as the syntax to obtain access to anonymous enum variants:\n\n\n    fn foo() -> A | B { todo!() }\n\n    match foo() {\n        x: A => {}\n        x: B => {}\n    }\n",
  "title": "Why can't pat_param be followed by a colon in macro_rules?"
}