230     check_spans(  in span_test()
486     check_spans("// abc", &[]);  in non_ascii_tokens()
487     check_spans("// ábc", &[]);  in non_ascii_tokens()
488     check_spans("// abc x", &[]);  in non_ascii_tokens()
489     check_spans("// ábc x", &[]);  in non_ascii_tokens()
490     check_spans("/* abc */ x", &[(1, 10, 1, 11)]);  in non_ascii_tokens()
491     check_spans("/* ábc */ x", &[(1, 10, 1, 11)]);  in non_ascii_tokens()
492     check_spans("/* ab\nc */ x", &[(2, 5, 2, 6)]);  in non_ascii_tokens()
493     check_spans("/* áb\nc */ x", &[(2, 5, 2, 6)]);  in non_ascii_tokens()
494     check_spans("/*** abc */ x", &[(1, 12, 1, 13)]);  in non_ascii_tokens()
495     check_spans("/*** ábc */ x", &[(1, 12, 1, 13)]);  in non_ascii_tokens()
496     check_spans(r#""abc""#, &[(1, 0, 1, 5)]);  in non_ascii_tokens()
497     check_spans(r#""ábc""#, &[(1, 0, 1, 5)]);  in non_ascii_tokens()
498     check_spans(r###"r#"abc"#"###, &[(1, 0, 1, 8)]);  in non_ascii_tokens()
499     check_spans(r###"r#"ábc"#"###, &[(1, 0, 1, 8)]);  in non_ascii_tokens()
500     check_spans("r#\"a\nc\"#", &[(1, 0, 2, 3)]);  in non_ascii_tokens()
501     check_spans("r#\"á\nc\"#", &[(1, 0, 2, 3)]);  in non_ascii_tokens()
502     check_spans("'a'", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
503     check_spans("'á'", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
504     check_spans("//! abc", &[(1, 0, 1, 7), (1, 0, 1, 7), (1, 0, 1, 7)]);  in non_ascii_tokens()
505     check_spans("//! ábc", &[(1, 0, 1, 7), (1, 0, 1, 7), (1, 0, 1, 7)]);  in non_ascii_tokens()
506     check_spans("//! abc\n", &[(1, 0, 1, 7), (1, 0, 1, 7), (1, 0, 1, 7)]);  in non_ascii_tokens()
507     check_spans("//! ábc\n", &[(1, 0, 1, 7), (1, 0, 1, 7), (1, 0, 1, 7)]);  in non_ascii_tokens()
508     check_spans("/*! abc */", &[(1, 0, 1, 10), (1, 0, 1, 10), (1, 0, 1, 10)]);  in non_ascii_tokens()
509     check_spans("/*! ábc */", &[(1, 0, 1, 10), (1, 0, 1, 10), (1, 0, 1, 10)]);  in non_ascii_tokens()
510     check_spans("/*! a\nc */", &[(1, 0, 2, 4), (1, 0, 2, 4), (1, 0, 2, 4)]);  in non_ascii_tokens()
511     check_spans("/*! á\nc */", &[(1, 0, 2, 4), (1, 0, 2, 4), (1, 0, 2, 4)]);  in non_ascii_tokens()
512     check_spans("abc", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
513     check_spans("ábc", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
514     check_spans("ábć", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
515     check_spans("abc// foo", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
516     check_spans("ábc// foo", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
517     check_spans("ábć// foo", &[(1, 0, 1, 3)]);  in non_ascii_tokens()
518     check_spans("b\"a\\\n c\"", &[(1, 0, 2, 3)]);  in non_ascii_tokens()
519     check_spans("b\"a\\\n\u{00a0}c\"", &[(1, 0, 2, 3)]);  in non_ascii_tokens()
523 fn check_spans(p: &str, mut lines: &[(usize, usize, usize, usize)]) {  in check_spans()  function