Copyright Mozilla Foundation

Licensed under the Apache License (Version 2.0), or the MIT license,
(the "Licenses") at your option. You may not use this file except in
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   https://www.apache.org/licenses/LICENSE-2.0
   https://opensource.org/licenses/MIT

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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the Licenses for the specific language governing permissions and
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--

Test code is dedicated to the Public Domain when so designated (see
the individual files for PD/CC0-dedicated sections).

--

The implementation for Utf8CharIndices was adapted from the
CharIndices implementation of the Rust standard library at revision
ab32548539ec38a939c1b58599249f3b54130026
(https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/library/core/src/str/iter.rs).

Excerpt from https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/COPYRIGHT ,
which refers to
https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-APACHE
and
https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-MIT
:

For full authorship information, see the version control history or
https://thanks.rust-lang.org

Except as otherwise noted (below and/or in individual files), Rust is
licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
<http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
<LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.