rust/src/test/ui/parser/foreign-const-syntactic-fail.rs

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// Syntactically, a `const` item inside an `extern { ... }` block is not allowed.
fn main() {}
#[cfg(FALSE)]
extern {
const A: isize; //~ ERROR extern items cannot be `const`
const B: isize = 42; //~ ERROR extern items cannot be `const`
}