70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
#![warn(clippy::unnecessary_result_map_or_else)]
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#![allow(clippy::unnecessary_literal_unwrap, clippy::let_and_return, clippy::let_unit_value)]
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fn main() {
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let x: Result<(), ()> = Ok(());
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x.map_or_else(|err| err, |n| n); //~ ERROR: unused "map closure" when calling
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// Type ascribtion.
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let x: Result<(), ()> = Ok(());
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x.map_or_else(|err: ()| err, |n: ()| n); //~ ERROR: unused "map closure" when calling
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// Auto-deref.
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let y = String::new();
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let x: Result<&String, &String> = Ok(&y);
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let y: &str = x.map_or_else(|err| err, |n| n); //~ ERROR: unused "map closure" when calling
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// Temporary variable.
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let x: Result<(), ()> = Ok(());
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x.map_or_else(
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//~^ ERROR: unused "map closure" when calling
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|err| err,
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|n| {
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let tmp = n;
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let tmp2 = tmp;
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tmp2
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},
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);
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// Should not warn.
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let x: Result<usize, usize> = Ok(0);
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x.map_or_else(|err| err, |n| n + 1);
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// Should not warn.
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let y = ();
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let x: Result<(), ()> = Ok(());
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x.map_or_else(|err| err, |_| y);
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// Should not warn.
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let y = ();
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let x: Result<(), ()> = Ok(());
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x.map_or_else(
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|err| err,
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|_| {
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let tmp = y;
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tmp
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},
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);
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// Should not warn.
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let x: Result<usize, usize> = Ok(1);
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x.map_or_else(
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|err| err,
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|n| {
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let tmp = n + 1;
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tmp
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},
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);
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// Should not warn.
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let y = 0;
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let x: Result<usize, usize> = Ok(1);
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x.map_or_else(
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|err| err,
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|n| {
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let tmp = n;
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y
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},
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);
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}
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