b54f593cff
This is the first part of #39018. One of the common things for new users coming from more dynamic languages like JavaScript, Python or Ruby is to use `+` to concatenate strings. However, this doesn't work that way in Rust unless the first type is a `String`. This commit adds a check for this use case and outputs a new error as well as a suggestion to guide the user towards the desired behavior. It also adds a new test case to test the output of the error.
24 lines
769 B
Rust
24 lines
769 B
Rust
// Copyright 2017 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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pub fn main() {
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let x = "Hello " + "World!";
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// Make sure that the span outputs a warning
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// for not having an implementation for std::ops::Add
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// that won't output for the above string concatenation
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let y = World::Hello + World::Goodbye;
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}
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enum World {
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Hello,
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Goodbye,
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}
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