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What do you mean? Rust 1.0 can compile Rust 1.0. Rust 1.1 can compile Rust 1.1.

• School-Cotton 2y ago
  Right, which is basically the opposite of what backwards incompatibility means. Imagine if GCC 14.2.0 was only guaranteed to be able to compile "C 14.2.0".
• gkbrk 2y ago
  C99 isn't a compiler version. It's a standard. Many versions of GCC, Clang and other compilers can compile C99 code. If you update your compiler from gcc 14.1 to gcc 14.2, both versions can still compile standard code.
  • uecker 2y ago
    There is also a very high level of backwards compatibility between versions of ISO C because there is a gigantic amount of code is updated if there is change. So such changes are done only for important reasons or after a very long deprecation period.
• johnisgood 2y ago
  But Rust 1.0 can't compile Rust 1.1. And as others have noted, C99 is a standard and Rust lacks one.
  • tremon 2y ago
    But Rust 1.0 can't compile Rust 1.1 That's an impossible standard to hold Rust to, did you mean it the other way around? A C89 compiler can't compile all of C99 either.
    • gkbrk 2y ago
      But v1 of a C99 compiler can compile all of C99, and v2 of a C99 compiler can still compile all of C99.
• chongli 2y ago
  C makes a distinction between the language version and the compiler version. Rust does not. That's the problem people are discussing here.