rust trait_error ai_generated true

the trait `X` is not implemented for `Y`

ID: rust/rust-trait-not-implemented

Also available as: JSON · Markdown
86%Fix Rate
89%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1 active — — —

Root Cause

A required trait bound is missing. Either implement the trait for your type or use a type that already implements it.

generic

Workarounds

  1. 92% success Derive or manually implement the required trait 
    #[derive(Clone, Debug)]
struct MyType { ... }
// or: impl MyTrait for MyType { ... }

    Sources: https://doc.rust-lang.org/book/ch10-02-traits.html

  2. 80% success Use a newtype wrapper that implements the needed trait 
    struct Wrapper(InnerType);
impl RequiredTrait for Wrapper { ... }

    Sources: https://doc.rust-lang.org/book/ch19-03-advanced-traits.html

Dead Ends

Common approaches that don't work:

  1. Add a blanket impl for all types using generics 75% fail

    Blanket impls conflict with existing implementations and create coherence issues

  2. Downcast with as to force type compatibility 90% fail

    Rust's as keyword only works for primitive numeric conversions, not trait conformance

Error Chain

Leads to:
Preceded by:
Frequently confused with: