[Bug] Rust raw strings with `br` or `cr` prefix are not treated as raw strings

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

monaco editor playground

Monaco Editor Playground Code

const value = /* set from `myEditor.getModel()`: */ `fn main() {
    let a = r#"abc\\"#;
    let b = br"abc\\";
    let c = cr"abc\\";
}`;

// Hover on each property to see its docs!
const myEditor = monaco.editor.create(document.getElementById("container"), {
	value,
	language: "rust",
	automaticLayout: true,
});

Reproduction Steps

Create and editor which includes rust code that uses br"\" or cr"\" raw strings.

Actual (Problematic) Behavior

The br and cr strings are treated as normal strings with escapes.

Expected Behavior

The br and cr strings should be treated as raw strings.

Additional Context

No response

Start with the linked Monaco Editor Playground and its Rust example to reproduce the behavior for br"..." and cr"..." strings. Trace the Rust language support responsible for string recognition, then verify that both prefixes are treated as raw strings rather than interpreting escapes.