..................
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Ran 18 tests in 0.004s

OK
<lex_mode_e DQ 7>

--- echo \" \\ hi` ---

(token id:Backtick_Other val:'echo ' span_id:0)
(token id:Backtick_Quoted val:'\\"' span_id:1)
(token id:Backtick_Other val:' ' span_id:2)
(token id:Backtick_Quoted val:'\\\\' span_id:3)
(token id:Backtick_Other val:' hi' span_id:4)
(token id:Backtick_Right val:'`' span_id:5)
(token id:Eof_Real val:'' span_id:6)

--- ` ---

(token id:Backtick_Right val:'`' span_id:0)
(token id:Eof_Real val:'' span_id:1)

---  ---

(token id:Eof_Real val:'' span_id:0)
(token id:Char_Literals val:'foo bar' span_id:0)
(token id:Char_OneChar val:'\\n' span_id:1)
(token id:Left_SingleQuote val:"'" span_id:0)
[(Char_Literals, 'newline '), (Char_OneChar, '\\n'), (Char_Literals, ' NUL '), (Char_OneChar, '\\0'), (Char_Literals, ' octal '), (Char_Octal4, '\\0377'), (Char_Literals, ' hex '), (Char_Hex, '\\x00')]
[(Char_Literals, 'unicode '), (Char_Unicode4, '\\u0065'), (Char_Literals, ' '), (Char_Unicode8, '\\U00000065')]
[(Char_BadBackslash, '\\'), (Char_Literals, 'd '), (Char_OneChar, '\\e'), (Char_Literals, ' '), (Char_OneChar, '\\f'), (Char_Literals, ' '), (Char_BadBackslash, '\\'), (Char_Literals, 'g')]
<function _MatchEchoToken_Fast at 0x7f28e8ad90c8>
[(History_Other, 'echo hi')]
[(History_Other, 'echo '), (History_Op, '!!'), (History_Other, ' '), (History_Op, '!*'), (History_Other, ' '), (History_Op, '!^'), (History_Other, ' '), (History_Op, '!$')]
[(History_Other, 'echo '), (History_Other, '\\!'), (History_Other, '!')]
[(History_Other, 'echo '), (History_Num, '!3'), (History_Other, '...')]
[(History_Other, 'echo '), (History_Num, '!-5'), (History_Other, '...')]
[(History_Other, 'echo '), (History_Search, '!x/foo.py'), (History_Other, ' bar')]
---
[(History_Other, 'echo '), (History_Other, "'!!'"), (History_Other, ' $'), (History_Other, "'!!'"), (History_Other, ' ')]
[(History_Other, 'echo '), (History_Other, "'!! ")]
[(History_Other, 'echo '), (History_Other, "\\'"), (History_Other, ' '), (History_Op, '!!'), (History_Other, ' ')]
[(PS_Literals, 'foo')]
[(PS_Subst, '\\h'), (PS_Literals, ' '), (PS_Subst, '\\w'), (PS_Literals, ' '), (PS_Subst, '\\$')]
P '[^\\\\\\0]+'