57 lines
1.2 KiB
Rust
57 lines
1.2 KiB
Rust
#![allow(unused)]
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#![warn(clippy::unnecessary_map_on_constructor)]
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use std::ffi::OsStr;
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fn fun(t: i32) -> i32 {
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t
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}
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fn notfun(e: SimpleError) -> SimpleError {
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e
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}
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macro_rules! expands_to_fun {
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() => {
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fun
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};
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}
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#[derive(Copy, Clone)]
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struct SimpleError {}
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type SimpleResult = std::result::Result<i32, SimpleError>;
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fn main() {
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let x: i32 = 4;
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let err = SimpleError {};
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let a = Some(x);
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let b: SimpleResult = Ok(x);
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let c: SimpleResult = Err(err);
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let a = Some(x).map(fun);
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let b: SimpleResult = Ok(x).map(fun);
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let c: SimpleResult = Err(err).map_err(notfun);
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let a = Option::Some(x).map(fun);
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let b: SimpleResult = SimpleResult::Ok(x).map(fun);
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let c: SimpleResult = SimpleResult::Err(err).map_err(notfun);
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let b: std::result::Result<i32, SimpleError> = Ok(x).map(fun);
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let c: std::result::Result<i32, SimpleError> = Err(err).map_err(notfun);
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let a = Some(fun(x));
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let b: SimpleResult = Ok(fun(x));
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let c: SimpleResult = Err(notfun(err));
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// Should not trigger warning
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a.map(fun);
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b.map(fun);
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c.map_err(notfun);
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b.map_err(notfun); // Ok(_).map_err
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c.map(fun); // Err(_).map()
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option_env!("PATH").map(OsStr::new);
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Some(x).map(expands_to_fun!());
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}
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