mirror of https://github.com/rust-lang/rust
30 lines
1.3 KiB
Rust
30 lines
1.3 KiB
Rust
struct Foo;
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fn takes_ref(_: &Foo) {}
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fn main() {
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let ref opt = Some(Foo);
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opt.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
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opt.and_then(|arg| Some(takes_ref(arg))); //~ ERROR mismatched types [E0308]
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let ref opt: Result<_, ()> = Ok(Foo);
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opt.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
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opt.and_then(|arg| Ok(takes_ref(arg))); //~ ERROR mismatched types [E0308]
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let x: &Option<usize> = &Some(3);
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let y: Option<&usize> = x; //~ ERROR mismatched types [E0308]
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let x: &Result<usize, usize> = &Ok(3);
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let y: Result<&usize, &usize> = x;
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//~^ ERROR mismatched types [E0308]
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// note: do not suggest because of `E: usize`
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let x: &Result<usize, usize> = &Ok(3);
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let y: Result<&usize, usize> = x; //~ ERROR mismatched types [E0308]
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let multiple_ref_opt = &&Some(Foo);
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multiple_ref_opt.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
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multiple_ref_opt.and_then(|arg| Some(takes_ref(arg))); //~ ERROR mismatched types [E0308]
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let multiple_ref_result = &&Ok(Foo);
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multiple_ref_result.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
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multiple_ref_result.and_then(|arg| Ok(takes_ref(arg))); //~ ERROR mismatched types [E0308]
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let _: Result<&usize, _> = &Ok(42); //~ ERROR mismatched types [E0308]
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}
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