46abacfdfe
This commit tightens up the restriction on types used to index slices to require exactly `uint` indices. Previously any integral type was accepted, but this leads to a few subtle problems: * 64-bit indices don't make much sense on 32-bit systems * Signed indices for slices used as negative indexing isn't implemented This was discussed at the recent work week, and also has some discussion on issue #10453. Closes #10453
26 lines
874 B
Rust
26 lines
874 B
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Make sure that indexing an array is only valid with a `uint`, not any other
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// integral type.
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fn main() {
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fn bar<T>(_: T) {}
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[0][0u8]; //~ ERROR: mismatched types
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[0][0]; // should infer to be a uint
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let i = 0; // i is an IntVar
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[0][i]; // i should be locked to uint
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bar::<int>(i); // i should not be re-coerced back to an int
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//~^ ERROR: mismatched types
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}
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