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remove wrong assert in check_match #32041

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Mar 6, 2016
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5 changes: 1 addition & 4 deletions src/librustc/middle/check_match.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1047,10 +1047,7 @@ fn is_refutable<A, F>(cx: &MatchCheckCtxt, pat: &Pat, refutable: F) -> Option<A>
{
let pats = Matrix(vec!(vec!(pat)));
match is_useful(cx, &pats, &[DUMMY_WILD_PAT], ConstructWitness) {
UsefulWithWitness(pats) => {
assert_eq!(pats.len(), 1);
Some(refutable(&pats[0]))
},
UsefulWithWitness(pats) => Some(refutable(&pats[0])),
NotUseful => None,
Useful => unreachable!()
}
Expand Down
20 changes: 20 additions & 0 deletions src/test/compile-fail/issue-31561.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
// 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.

enum Thing {
Foo(u8),
Bar,
Baz
}

fn main() {
let Thing::Foo(y) = Thing::Foo(1);
//~^ ERROR refutable pattern in local binding: `Bar` not covered
}