Function compile_script_owned_by 

pub fn compile_script_owned_by(
    owning_package: &str,
    source: &str,
    filename: &str,
    file: FileId,
    packages: &[&PackageDeclaration],
    mcps: &[&PackageDeclaration],
) -> Result<CompiledScript, Vec<Diagnostic>>

Compatibility adapter returning source and fatal failures as diagnostics.