Fix E0076: This Function Is Not a Struct or Enum Constructor

Sun, 26 Jul 2026 05:32:04 +0800

1. Symptoms

Error E0076 manifests when you attempt to invoke a function using struct literal syntax, but that function is not actually a constructor for a struct or enum type. The Rust compiler enforces strict rules about how constructor-like syntax can be used, and this error appears when those rules are violated.

When this error occurs, you will see output similar to the following in your compiler output:

error[E0076]: this function is not a struct or enum constructor
  --> src/main.rs:10:12
   |
10 |     let result = MyFunction { arg1: 42, arg2: "hello" };
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: structs need to be instantiated with a full expression like `MyStruct { field: value }`
   = note: enum variants need to be instantiated with a full expression like `MyEnum::Variant { field: value }`

The error points to the specific line where the incorrect syntax was used, and the note section provides clarifying guidance about how struct and enum instantiation should be performed. You may also encounter scenarios where the function takes multiple arguments, and you are incorrectly attempting to pass them as struct fields:

E0076 on ErrorVault — Developer Error Code Dictionary

Fix E0076: This Function Is Not a Struct or Enum Constructor

1. Symptoms