Abi on ErrorVault — Developer Error Code Dictionary

Fix E0583: Linkage Name Is Not Unique

Mon, 03 Aug 2026 12:44:04 +0800

1. Symptoms

When the Rust compiler encounters error E0583, you will see a diagnostic message similar to the following in your build output:

error[E0583]: linkage name is not unique
  --> src/main.rs:10:1
   |
10 | extern "C" {
11 |     #[link_name = "my_function"]
12 |     fn my_function();
13 |     #[link_name = "my_function"]
14 |     fn my_function();
15 | }
   |
   = linkage name `my_function` used in multiple `extern` blocks for the same ABI

The compiler identifies that the same linkage name appears multiple times within an extern block, which violates the uniqueness requirement for foreign function symbols. The error points to the specific lines where the duplicate declarations occur and includes a note explaining that the linkage name must be unique for each ABI.

Fix E0210: Type Name is Reserved as a Foreign Type Name

Sat, 25 Jul 2026 19:56:04 +0800

1. Symptoms

The Rust compiler emits error E0210 when you attempt to define a struct, enum, union, or type alias using a name that is reserved for foreign type bindings. This error typically manifests during compilation and prevents the code from building successfully.

Shell Output

When E0210 is triggered, the compiler produces output similar to the following:

error[E0210]: type name `c_int` is reserved as a foreign type name
  --> src/main.rs:3:1
  |
3  | struct c_int { value: i32 }
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ this name is reserved for foreign types
  |
  = note: these names are reserved through the FFI unsafe guidelines:
          https://doc.rust-lang.org/nomicon/ffi.html

In some cases, the error message might reference a different reserved name:

Fix E0795: Mismatched Function Pointer Alignment in Rust

Fri, 17 Jul 2026 12:44:04 +0800

1. Symptoms

When the Rust compiler encounters error E0795, you will see output similar to the following:

error[E0795]: function pointer types that differ only in their alignment
  --> src/main.rs:10:5
   |
10 |     let fp: fn() = extern_func;
   |              ^^^^^^^^^^^^^^^^ expected function pointer with alignment 1, found one with alignment 8
   |
   = note: `extern_func` points to a function with stricter alignment requirements than what the target type accepts
   = note: this commonly occurs when passing function pointers across FFI boundaries with mismatched ABIs

In more severe cases involving extern blocks, the error may manifest as: