Fix E0046: Not All Trait Items Implemented

Fri, 05 Jun 2026 12:44:04 +0800

1. Symptoms

The Rust compiler emits error E0046 when you attempt to implement a trait but fail to provide implementations for all required items. The compiler will list exactly which items are missing from your implementation.

Here is what the error looks like when you run cargo build:

error[E0046]: not all trait items implemented, missing: `get_id`, `set_name` in implementation of `Entity` for `MyStruct`
 --> src/main.rs:6:1
  |
6 | impl Entity for MyStruct {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `get_id`, `set_name`

When dealing with more complex traits, the error message becomes more verbose. For example, if you only implement one method out of three required methods:

E0046 on ErrorVault — Developer Error Code Dictionary

Fix E0046: Not All Trait Items Implemented

1. Symptoms