mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
typeck: use NoExpectation to check return type of diverging fn
This fixes #35849, a regression introduced by the typeck refactoring around TyNever/!.
This commit is contained in:
parent
490189634b
commit
702ea7169c
@ -1479,7 +1479,13 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
|
||||
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),
|
||||
|
@ -708,7 +708,13 @@ fn check_fn<'a, 'gcx, 'tcx>(inherited: &'a Inherited<'a, 'gcx, 'tcx>,
|
||||
|
||||
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
|
||||
}
|
||||
|
16
src/test/compile-fail/diverging-fn-tail-35849.rs
Normal file
16
src/test/compile-fail/diverging-fn-tail-35849.rs
Normal file
@ -0,0 +1,16 @@
|
||||
// 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() { }
|
||||
|
@ -10,6 +10,7 @@
|
||||
|
||||
// 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)]
|
||||
|
18
src/test/run-pass/diverging-fn-tail-35849.rs
Normal file
18
src/test/run-pass/diverging-fn-tail-35849.rs
Normal file
@ -0,0 +1,18 @@
|
||||
// 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() { }
|
||||
|
Loading…
Reference in New Issue
Block a user