Fix E0763: Dereferencing a Raw Pointer in a const fn is Unstable

Tue, 16 Jun 2026 10:20:04 +0800

1. Symptoms

When attempting to dereference a raw pointer inside a const fn, the Rust compiler produces error E0763 with the following message:

error[E0763]: dereferencing a raw pointer in a `const fn` is unstable
  |
  = note: this error occurs in the following function:
  --> src/main.rs:6:1
    |
  6  | const fn get_value(ptr: *const i32) -> i32 {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The compiler may also emit additional notes about requiring nightly features:

  |
  = note: see Rust RFC #2582 for more information about this feature.

In some cases, you might see additional context about requiring specific feature flags:

Raw-Pointer on ErrorVault — Developer Error Code Dictionary

Fix E0763: Dereferencing a Raw Pointer in a const fn is Unstable

1. Symptoms