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Rich Felker
@RichFelker
😱😱😱 Is this for real? And if so, who came up with the idea of allowing this type of host code to be run from macros?!?!?
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Mara Bos
@m_ou_se
Did you know you can just fork() the @rustlang compiler from your proc_macro? :D This is, of course, a horrible idea.
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fn main() { whichever_compiles! { try { thisfunctiondoesntexist(); } try { 1 2 3 invalid syntax } try { println!("missing arg: {}"); } try { println!("hello {}", world()); } try { 1 + 2 } } } whichever_compiles! { try { } try { fn world() {} } try { fn world() -> &'static str { "world" } } }
$ cargo run Compiling ohno v0.1.0 Finished dev [unoptimized + debuginfo] target(s) in 0.73s Running `target/debug/ohno` hello world
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Rich Felker
@RichFelker
Like, I've seen a lot of bad things about Rust, but this one, if I understand it, is the first that's so absolutely awful it simply must be changed, fuck backwards compatibility, for the language not to be utterly unacceptably broken.
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