Fix E0387: Method Called on Trait Object Without Object Safety

Wed, 12 Aug 2026 12:44:04 +0800

1. Symptoms

When the Rust compiler encounters error E0387, you will see output similar to the following in your terminal:

error[E0387]: cannot call method `method_name` on a type `dyn TraitName`
  --> src/main.rs:12:5
   |
12 |     obj.method_name();
   |     ^^^^^^^^^^^^^^^^^ method `method_name` is not available on `dyn TraitName`
   |
   = note: method `method_name` has no `self` parameter
   = note: trait `TraitName` defines an item with this name, but this method cannot be dispatched to a trait object

Another variant of this error appears when you attempt to call a method that exists on the underlying type but is not part of the trait’s interface:

E0387 on ErrorVault — Developer Error Code Dictionary

Fix E0387: Method Called on Trait Object Without Object Safety

1. Symptoms