23 lines
665 B
Rust
23 lines
665 B
Rust
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// check-compile
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struct DisplayOnly;
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impl std::fmt::Display for DisplayOnly {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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unimplemented!()
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}
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}
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fn main() {
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let x = Some(1);
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println!("{x:?} {x} {x:?}");
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//~^ ERROR: `Option<{integer}>` doesn't implement `std::fmt::Display`
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println!("{x:?} {x} {x:?}", x = Some(1));
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//~^ ERROR: `Option<{integer}>` doesn't implement `std::fmt::Display`
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let x = DisplayOnly;
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println!("{x} {x:?} {x}");
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//~^ ERROR: `DisplayOnly` doesn't implement `Debug`
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println!("{x} {x:?} {x}", x = DisplayOnly);
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//~^ ERROR: `DisplayOnly` doesn't implement `Debug`
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}
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