Function result_method 

pub fn result_method(
    receiver: &Value,
    method: &str,
    args: &[Value],
    line: u32,
) -> Result<Option<Value>, BopError>

Pure Result method dispatch. Handles is_ok, is_err, unwrap, expect, unwrap_or — the combinators whose implementation doesn’t need to invoke a user callable.

Returns Ok(Some(value)) when the method name matched, Ok(None) when it didn’t (so the caller falls through to the callable-taking Result methods, then to the standard dispatcher). Assumes receiver is already known to be a built-in Result — callers check is_builtin_result first.