refactor/test ~ polish spelling (comments, names, and exceptions)
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.
+// spell-checker:ignore (grammar) BOOLOP STRLEN FILETEST FILEOP INTOP STRINGOP ; (vars) LParen StrlenOp
+
use std::ffi::OsString;
use std::iter::Peekable;
