self.ir.tcx.region_maps.call_site_extent(id, body.id),
&self.fn_ret(id));
- if self.live_on_entry(entry_ln, self.s.no_ret_var).is_some() {
+ if fn_ret.is_never() {
+ // FIXME(durka) this rejects code like `fn foo(x: !) -> ! { x }`
+ if self.live_on_entry(entry_ln, self.s.clean_exit_var).is_some() {
+ span_err!(self.ir.tcx.sess, sp, E0270,
+ "computation may converge in a function marked as diverging");
+ }
+ } else if self.live_on_entry(entry_ln, self.s.no_ret_var).is_some() {
let param_env = ParameterEnvironment::for_item(self.ir.tcx, id);
let t_ret_subst = fn_ret.subst(self.ir.tcx, ¶m_env.free_substs);
let is_nil = self.ir.tcx.infer_ctxt(None, Some(param_env),
inherited.tables.borrow_mut().liberated_fn_sigs.insert(fn_id, fn_sig);
- fcx.check_block_with_expected(body, ExpectHasType(fcx.ret_ty));
+ // FIXME(aburka) do we need this special case? and should it be is_uninhabited?
+ let expected = if fcx.ret_ty.is_never() {
+ NoExpectation
+ } else {
+ ExpectHasType(fcx.ret_ty)
+ };
+ fcx.check_block_with_expected(body, expected);
fcx
}
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn _converge() -> ! { //~ ERROR computation may converge
+ 42
+}
+
+fn main() { }
+
// Test that we can use a ! for an argument of type !
+// ignore-test FIXME(durka) can't be done with the current liveness code
// error-pattern:wowzers!
#![feature(never_type)]
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn assert_sizeof() -> ! {
+ unsafe {
+ ::std::mem::transmute::<f64, [u8; 8]>(panic!())
+ }
+}
+
+fn main() { }
+