mirror of https://github.com/rust-lang/rust.git
update `fn_must_use` UI test to exercise nonprimitive comparisons
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@ -11,6 +11,7 @@
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#![feature(fn_must_use)]
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#![warn(unused_must_use)]
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#[derive(PartialEq, Eq)]
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struct MyStruct {
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n: usize,
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}
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@ -58,12 +59,18 @@ fn main() {
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need_to_use_this_value();
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let mut m = MyStruct { n: 2 };
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let n = MyStruct { n: 3 };
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m.need_to_use_this_method_value();
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m.is_even(); // trait method!
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m.replace(3); // won't warn (annotation needs to be in trait definition)
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2.eq(&3); // comparison methods are `must_use`
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// comparison methods are `must_use`
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2.eq(&3);
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m.eq(&n);
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2 == 3; // lint includes comparison operators
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// lint includes comparison operators
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2 == 3;
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m == n;
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}
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@ -1,7 +1,7 @@
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warning: unused return value of `need_to_use_this_value` which must be used: it's important
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--> $DIR/fn_must_use.rs:58:5
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--> $DIR/fn_must_use.rs:59:5
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58 | need_to_use_this_value();
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59 | need_to_use_this_value();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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note: lint level defined here
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@ -11,26 +11,38 @@ note: lint level defined here
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| ^^^^^^^^^^^^^^^
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warning: unused return value of `MyStruct::need_to_use_this_method_value` which must be used
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--> $DIR/fn_must_use.rs:61:5
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--> $DIR/fn_must_use.rs:64:5
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61 | m.need_to_use_this_method_value();
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64 | m.need_to_use_this_method_value();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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warning: unused return value of `EvenNature::is_even` which must be used: no side effects
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--> $DIR/fn_must_use.rs:62:5
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--> $DIR/fn_must_use.rs:65:5
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62 | m.is_even(); // trait method!
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65 | m.is_even(); // trait method!
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| ^^^^^^^^^^^^
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warning: unused return value of `std::cmp::PartialEq::eq` which must be used
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--> $DIR/fn_must_use.rs:66:5
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--> $DIR/fn_must_use.rs:70:5
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66 | 2.eq(&3); // comparison methods are `must_use`
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70 | 2.eq(&3);
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| ^^^^^^^^^
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warning: unused return value of `std::cmp::PartialEq::eq` which must be used
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--> $DIR/fn_must_use.rs:71:5
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71 | m.eq(&n);
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| ^^^^^^^^^
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warning: unused comparison which must be used
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--> $DIR/fn_must_use.rs:68:5
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--> $DIR/fn_must_use.rs:74:5
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68 | 2 == 3; // lint includes comparison operators
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74 | 2 == 3;
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| ^^^^^^
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warning: unused comparison which must be used
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--> $DIR/fn_must_use.rs:75:5
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75 | m == n;
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| ^^^^^^
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