c2bda2a5bb
The new `::ops::Range` has separated implementations for each of the numeric types, while the old `::iter::Range` has one for type `Int`. However, we do not take output bindings into account when selecting traits. So it confuses `typeck` and makes the new range does not work as good as the old one when it comes to type inference. This patch implements `Iterator` for the new range for one type `Int`. This limitation could be lifted, however, if we ever reconsider the output types' role in type inference. Closes #21595 Closes #21649 Closes #21672
27 lines
930 B
Rust
27 lines
930 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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// Test range syntax - type errors.
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pub fn main() {
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// Mixed types.
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let _ = 0u32..10i32;
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//~^ ERROR start and end of range have incompatible types
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// Float => does not implement iterator.
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for i in 0f32..42f32 {}
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//~^ ERROR the trait `core::num::Int` is not implemented for the type `f32`
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// Unsized type.
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let arr: &[_] = &[1u32, 2, 3];
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let range = *arr..;
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//~^ ERROR the trait `core::marker::Sized` is not implemented
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}
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