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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
macro_rules! try_opt {
($expr:expr, $err_type:expr, $err_msg:expr) => {{
match $expr {
Some(x) => x,
None => return Err(WebDriverError::new($err_type, $err_msg)),
}
}};
}