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//@ proc-macro: format-string-proc-macro.rs
#[macro_use]
extern crate format_string_proc_macro;
macro_rules! def_site {
() => { "{foo}" } //~ ERROR: there is no argument named `foo`
}
macro_rules! call_site {
($fmt:literal) => { $fmt }
}
fn main() {
format!(concat!("{foo}")); //~ ERROR: there is no argument named `foo`
format!(concat!("{ba", "r} {}"), 1); //~ ERROR: there is no argument named `bar`
format!(def_site!());
format!(call_site!("{foo}")); //~ ERROR: there is no argument named `foo`
format!(foo_with_input_span!("")); //~ ERROR: there is no argument named `foo`
}
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