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3E Rust: Rework type inference for impl Trait in return position by hvitved · Pull Request #19954 · github/codeql · GitHub
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Rust: Rework type inference for impl Trait in return position #19954

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Rust: Rework type inference for impl Trait in return position #19954

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22091d2
Rust: Add more type inference tests
hvitved Jul 2, 2025
e4650fb
Rust: Rework type inference for impl Trait in return position
hvitved Jul 2, 2025
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Rust: Add more type inference tests
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@hvitved
hvitved committed Jul 11, 2025
commit 22091d2f28243a191a744fbd94c1f05b05505786
12 changes: 6 additions & 6 deletions rust/ql/test/library-tests/type-inference/CONSISTENCY/PathResolutionConsistency.expected
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
multipleCallTargets
| dereference.rs:61:15:61:24 | e1.deref() |
| main.rs:2186:13:2186:31 | ...::from(...) |
| main.rs:2187:13:2187:31 | ...::from(...) |
| main.rs:2188:13:2188:31 | ...::from(...) |
| main.rs:2194:13:2194:31 | ...::from(...) |
| main.rs:2195:13:2195:31 | ...::from(...) |
| main.rs:2196:13:2196:31 | ...::from(...) |
| main.rs:2200:13:2200:31 | ...::from(...) |
| main.rs:2201:13:2201:31 | ...::from(...) |
| main.rs:2202:13:2202:31 | ...::from(...) |
| main.rs:2208:13:2208:31 | ...::from(...) |
| main.rs:2209:13:2209:31 | ...::from(...) |
| main.rs:2210:13:2210:31 | ...::from(...) |
14 changes: 14 additions & 0 deletions rust/ql/test/library-tests/type-inference/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1854,8 +1854,10 @@ mod async_ {
}

mod impl_trait {
#[derive(Clone)]
struct S1;
struct S2;
struct S3<T3>(T3);

trait Trait1 {
fn f1(&self) {} // Trait1f1
Expand Down Expand Up @@ -1887,10 +1889,21 @@ mod impl_trait {
}
}

impl<T: Clone> MyTrait<T> for S3<T> {
fn get_a(&self) -> T {
let S3(t) = self;
t.clone()
}
}

fn get_a_my_trait() -> impl MyTrait<S2> {
S1
}

fn get_a_my_trait2<T: Clone>(x: T) -> impl MyTrait<T> {
S3(x)
}

fn uses_my_trait1<A, B: MyTrait<A>>(t: B) -> A {
t.get_a() // $ method=MyTrait::get_a
}
Expand All @@ -1908,6 +1921,7 @@ mod impl_trait {
let a = get_a_my_trait(); // $ method=get_a_my_trait
let c = uses_my_trait2(a); // $ type=c:S2 method=uses_my_trait2
let d = uses_my_trait2(S1); // $ type=d:S2 method=uses_my_trait2
let e = get_a_my_trait2(S1).get_a(); // $ method=get_a_my_trait2 method=MyTrait::get_a $ MISSING: type=e:S1
}
}

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