51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
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fn main() {
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let addr = Into::<std::net::IpAddr>.into([127, 0, 0, 1]);
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//~^ ERROR expected value, found trait `Into`
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//~| HELP use the path separator
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let _ = Into.into(());
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//~^ ERROR expected value, found trait `Into`
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//~| HELP use the path separator
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let _ = Into::<()>.into;
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//~^ ERROR expected value, found trait `Into`
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//~| HELP use the path separator
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}
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macro_rules! Trait {
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() => {
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::std::iter::Iterator
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//~^ ERROR expected value, found trait `std::iter::Iterator`
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//~| ERROR expected value, found trait `std::iter::Iterator`
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};
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}
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macro_rules! create {
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() => {
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Into::<String>.into("")
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//~^ ERROR expected value, found trait `Into`
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//~| HELP use the path separator
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};
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}
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fn interaction_with_macros() {
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//
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// Note that if the receiver is a macro call, we do not want to suggest to replace
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// `.` with `::` as that would be a syntax error.
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// Since the receiver is a trait and not a type, we cannot suggest to surround
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// it with angle brackets. It would be interpreted as a trait object type void of
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// `dyn` which is most likely not what the user intended to write.
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// `<_ as Trait!()>::` is also not an option as it's equally syntactically invalid.
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//
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Trait!().map(std::convert::identity); // no `help` here!
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Trait!().map; // no `help` here!
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//
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// Ensure that the suggestion is shown for expressions inside of macro definitions.
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//
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let _ = create!();
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}
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