wp-includes/class-wp-rewrite.php:1859Removes a permalink structure.
$namestring public function remove_permastruct( $name ) { unset( $this->extra_permastructs[ $name ] ); }Introduced in 4.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.