rust/src/test/codegen/ffi-pure.rs

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// compile-flags: -C no-prepopulate-passes
#![crate_type = "lib"]
#![feature(ffi_pure)]
pub fn bar() { unsafe { foo() } }
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extern "C" {
// CHECK-LABEL: declare void @foo()
// CHECK-SAME: [[ATTRS:#[0-9]+]]
// CHECK-DAG: attributes [[ATTRS]] = { {{.*}}readonly{{.*}} }
#[ffi_pure] pub fn foo();
}