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Created utility uninhabited type #6348

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Created utility uninhabited type #6348

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16 changes: 15 additions & 1 deletion src/libcore/util.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
Expand Down Expand Up @@ -74,6 +74,20 @@ impl Drop for NonCopyable {

pub fn NonCopyable() -> NonCopyable { NonCopyable { i: () } }


/// A type with no inhabitants
pub enum Void { }

pub impl Void {
/// A utility function for ignoring this uninhabited type
fn uninhabited(&self) -> ! {
match *self {
// Nothing to match on
}
}
}


/**
A utility function for indicating unreachable code. It will fail if
executed. This is occasionally useful to put after loops that never
Expand Down