Rust error E0648: `export_name` may not contain null characters

What rustc prints

error[E0648]: `export_name` may not contain null characters
 --> main.rs:1:1
  |
1 | #[export_name="\0foo"] // error: `export_name` may not contain null characters
  | ^^^^^^^^^^^^^^^^^^^^^^

Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.

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

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

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