{
  "$type": "site.standard.document",
  "bskyPostRef": {
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  "path": "/t/using-pre-2015-rust/24007#post_9",
  "publishedAt": "2026-02-20T18:43:51.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "eggyal:\n\n> But, if Rust has always maintained backwards compatibility, shouldn't a newer rustc always be able to \"bootstrap\" an older one?\n>\n> Edit: no, because the compiler will have used unstable features that have since changed/been removed.\n\nAlso, Rust did not maintain backward compatibility with versions below 1.0.",
  "title": "Using pre-2015 Rust"
}