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Add an example of using a function-like proc macro in expression position #858
Description
A simple example:
use proc_macro::TokenStream;
#[proc_macro]
fn comptime(_input: TokenStream) -> TokenStream {
"1 + 2".parse().unwrap()
}
fn main() {
println!("1 + 2 = {}", comptime!());
}This particular example isn't particularly interesting, but I don't know proc macros very well yet :)
Activity
camelid commentedon Jul 28, 2020
@rustbot modify labels to A-proc-macro New Content Easy
rustbot commentedon Jul 28, 2020
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@rust-lang/releaseknow if you're having trouble with this bot.camelid commentedon Jul 28, 2020
Something in statement and pattern positions might be nice too to make it clear that you can use them many more places now
camelid commentedon Jul 29, 2020
I also didn't see any examples in the docs of how to consume the input stream. It would be great if someone who has more knowledge of proc macros could add that!