This PR implements proper file parsing error handling. Previously `file_options` would call `pm_string_mapped_init` which would print an error from `perror`. However this wouldn't raise a proper Ruby error so it was just a string output. I've done the following: - Raise an error from `rb_syserr_fail` with the filepath in `file_options`. - No longer return `Qnil` if `file_options` returns false (because now it will raise) - Update `file_options` to return `static void` instead of `static bool`. - Update `file_options` and `profile_file` to check the type so when passing `nil` we see a `TypeError`. - Delete `perror` from `pm_string_mapped_init` - Update `FFI` backend to raise appropriate errors when calling `pm_string_mapped_init`. - Add tests for `dump_file`, `lex_file`, `parse_file`, `parse_file_comments`, `parse_lex_file`, and `parse_file_success?` when a file doesn't exist and for `nil`. - Updates the `bin/parse` script to no longer raise it's own `ArgumentError` now that we raise a proper error. Fixes: ruby/prism#2207 https://github.com/ruby/prism/commit/b2f7494ff5