rust/src/test/compile-fail/missing-do.rs

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// Regression test for issue #2783
fn foo(f: fn()) { f() }
fn main() {
"" || 42; //! ERROR binary operation || cannot be applied to type `str`
foo || {}; //! ERROR binary operation || cannot be applied to type `extern fn(fn())`
//!^ NOTE did you forget the 'do' keyword for the call?
}