mirror of https://github.com/rust-lang/rust
35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
fn produces_string() -> Option<String> {
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Some("my cool string".to_owned())
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}
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fn takes_str_but_too_many_refs(_: &&str) -> Option<()> {
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Some(())
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}
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fn no_args() -> Option<()> {
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Some(())
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}
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extern "C" fn takes_str_but_wrong_abi(_: &str) -> Option<()> {
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Some(())
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}
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unsafe fn takes_str_but_unsafe(_: &str) -> Option<()> {
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Some(())
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}
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struct TypeWithoutDeref;
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fn main() {
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let _ = produces_string().and_then(takes_str_but_too_many_refs);
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//~^ ERROR type mismatch in function arguments
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let _ = produces_string().and_then(takes_str_but_wrong_abi);
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//~^ ERROR expected a `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
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let _ = produces_string().and_then(takes_str_but_unsafe);
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//~^ ERROR expected a `FnOnce(String)` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
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let _ = produces_string().and_then(no_args);
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//~^ ERROR function is expected to take 1 argument, but it takes 0 arguments
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let _ = Some(TypeWithoutDeref).and_then(takes_str_but_too_many_refs);
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//~^ ERROR type mismatch in function arguments
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}
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