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:

E0795 on ErrorVault — Developer Error Code Dictionary

Fix E0795: Mismatched Function Pointer Alignment in Rust

1. Symptoms