Understanding and Fixing Rust Error E0648

Introduction to Rust Error E0648

Rust Error E0648 is triggered when an export_name attribute contains null characters (\0). In this article, we will explain the error in detail, provide examples of erroneous code, and show you how to fix it.

Erroneous Code Example

#![allow(unused)]
fn main() {
#[export_name="\0foo"] // error: `export_name` may not contain null characters
pub fn bar() {}
}

In the code above, the export_name attribute contains a null character (\0) which leads to Rust Error E0648. The export_name attribute is used to specify a different name for the exported function in the compiled output.

Fixing Rust Error E0648

To fix Rust Error E0648, you need to remove the null character (\0) from the export_name attribute. Here's the modified version of the previous code example, which is error-free:

#![allow(unused)]
fn main() {
#[export_name="foo"] // ok!
pub fn bar() {}
}

In this corrected code, we have removed the null character (\0) from the export_name attribute, thus resolving Rust Error E0648.

Common Scenarios and Best Practices

It's important to avoid using null characters in string literals, not just in export_name attributes. Null characters can lead to unexpected behavior and hard-to-debug issues. In general, ensure your string literals and identifiers do not contain null characters or any other non-printable characters.

Conclusion

Rust Error E0648 occurs when an export_name attribute contains a null character (\0). To fix this error, simply remove the null character from the attribute. Remember to keep your string literals and identifiers free of null characters and other non-printable characters to avoid similar errors.