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Trait implemented for all T is not resolved #3940

Closed
Tracked by #2568
sirasistant opened this issue Jan 3, 2024 · 0 comments · Fixed by #4013
Closed
Tracked by #2568

Trait implemented for all T is not resolved #3940

sirasistant opened this issue Jan 3, 2024 · 0 comments · Fixed by #4013
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bug Something isn't working

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@sirasistant
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Aim

Implementing a trait for types that implements two other traits:

use dep::std::ops::Eq;
use dep::std::default::Default;

trait IsDefault {
    fn is_default(self) -> bool;
}

impl<T> IsDefault for T where T: Default + Eq {
    fn is_default(self) -> bool {
        self.eq(T::default())
    }
}

struct Foo {
    a: u64,
}

impl Eq for Foo {
    fn eq(self, other: Foo) -> bool { self.a == other.a } 
}

impl Default for Foo {
    fn default() -> Self {
        Foo { a: Default::default() }
    }
}

fn main(a: Foo) -> pub bool {
    a.is_default()
}

Expected Behavior

Should compile!

Bug

fails with

No method named 'is_default' found for type 'Foo'

To Reproduce

Installation Method

None

Nargo Version

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

No

Support Needs

No response

@sirasistant sirasistant added the bug Something isn't working label Jan 3, 2024
@jfecher jfecher self-assigned this Jan 3, 2024
@Savio-Sou Savio-Sou mentioned this issue Jan 5, 2024
46 tasks
github-merge-queue bot pushed a commit that referenced this issue Jan 15, 2024
#4013)

Resolved: #3940

Functionality was already there, but a `?` operator was short circuiting
the resolution if the known type didn't have the implemented methods,
avoiding looking for the generic implementations.
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3 participants