16a71cce51
First, we keep a `CoerceMany` now to find the LUB of all the break expressions. Second, this `CoerceMany` is actually an `Option<CoerceMany>`, and we store `None` for loops where "break with an expression" is disallowed. This avoids silly duplicate errors about a type mismatch, since the loops pass already reports an error that the break cannot have an expression. Finally, since we now detect an invalid break target during HIR lowering, refactor `find_loop` to be infallible. Adjust tests as needed: - some spans from breaks are slightly different - break up a single loop into multiple since `CoerceMany` silences redundant and derived errors - add a ui test that we only give on error for loop-break-value
26 lines
1 KiB
Rust
26 lines
1 KiB
Rust
// Copyright 2012-2014 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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// Regression test for #27042. Test that a loop's label is included in its span.
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fn main() {
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let _: i32 =
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'a: // in this case, the citation is just the `break`:
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loop { break }; //~ ERROR mismatched types
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let _: i32 =
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'b: //~ ERROR mismatched types
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while true { break }; // but here we cite the whole loop
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let _: i32 =
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'c: //~ ERROR mismatched types
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for _ in None { break }; // but here we cite the whole loop
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let _: i32 =
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'd: //~ ERROR mismatched types
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while let Some(_) = None { break };
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}
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