// The purpose of this feature gate is to make something into a hard error in a
// future edition.  Consequently, this test differs from most other feature gate
// tests.  Instead of verifying that an error occurs when the feature gate is
// missing, it ensures that the hard error is only produced with the feature
// gate is present in the `future` edition -- and otherwise that only a warning
// is emitted.

//@ revisions: current current_feature future future_feature

//@ [current] run-rustfix
//@ [current] check-pass

//@ [current_feature] run-rustfix
//@ [current_feature] check-pass

//@ [future] edition: future
//@ [future] compile-flags: -Z unstable-options
//@ [future] run-rustfix
//@ [future] check-pass

//@ [future_feature] edition: future
//@ [future_feature] compile-flags: -Z unstable-options

#![cfg_attr(future_feature, feature(explicit_extern_abis))]
#![cfg_attr(current_feature, feature(explicit_extern_abis))]

extern "C" fn _foo() {}
//[current]~^ WARN `extern` declarations without an explicit ABI are deprecated
//[current_feature]~^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future]~^^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future_feature]~^^^^ ERROR `extern` declarations without an explicit ABI are disallowed

unsafe extern "C" fn _bar() {}
//[current]~^ WARN `extern` declarations without an explicit ABI are deprecated
//[current_feature]~^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future]~^^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future_feature]~^^^^ ERROR `extern` declarations without an explicit ABI are disallowed

unsafe extern "C" {}
//[current]~^ WARN `extern` declarations without an explicit ABI are deprecated
//[current_feature]~^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future]~^^^ WARN `extern` declarations without an explicit ABI are deprecated
//[future_feature]~^^^^ ERROR `extern` declarations without an explicit ABI are disallowed

fn main() {}