...................
----------------------------------------------------------------------
Ran 19 tests in 0.002s

OK
<lex_mode_t 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)
[(<Id_t Char_Literals 243>, 'newline '), (<Id_t Char_OneChar 236>, '\\n'), (<Id_t Char_Literals 243>, ' NUL '), (<Id_t Char_OneChar 236>, '\\0'), (<Id_t Char_Literals 243>, ' octal '), (<Id_t Char_Octal4 240>, '\\0377'), (<Id_t Char_Literals 243>, ' hex '), (<Id_t Char_Hex 238>, '\\x00')]
[(<Id_t Char_Literals 243>, 'unicode '), (<Id_t Char_Unicode4 241>, '\\u0065'), (<Id_t Char_Literals 243>, ' '), (<Id_t Char_Unicode8 242>, '\\U00000065')]
[(<Id_t Char_BadBackslash 244>, '\\'), (<Id_t Char_Literals 243>, 'd '), (<Id_t Char_OneChar 236>, '\\e'), (<Id_t Char_Literals 243>, ' '), (<Id_t Char_OneChar 236>, '\\f'), (<Id_t Char_Literals 243>, ' '), (<Id_t Char_BadBackslash 244>, '\\'), (<Id_t Char_Literals 243>, 'g')]
<function _MatchEchoToken_Fast at 0x7f4bde3b1758>
[(<Id_t History_Other 36>, '['), (<Id_t History_Other 36>, '!'), (<Id_t History_Other 36>, 'abc]')]
[(<Id_t History_Other 36>, '${'), (<Id_t History_Other 36>, '!'), (<Id_t History_Other 36>, 'indirect}')]
[(<Id_t History_Other 36>, '$'), (<Id_t History_Other 36>, '!'), (<Id_t History_Other 36>, 'x')]
[(<Id_t History_Other 36>, '!'), (<Id_t History_Other 36>, '(foo|bar)')]
[(<Id_t History_Other 36>, 'echo hi')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Op 33>, '!!'), (<Id_t History_Other 36>, ' '), (<Id_t History_Op 33>, '!*'), (<Id_t History_Other 36>, ' '), (<Id_t History_Op 33>, '!^'), (<Id_t History_Other 36>, ' '), (<Id_t History_Op 33>, '!$')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Other 36>, '\\!'), (<Id_t History_Other 36>, '!')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Num 34>, '!3'), (<Id_t History_Other 36>, '...')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Num 34>, '!-5'), (<Id_t History_Other 36>, '...')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Search 35>, '!x/foo.py '), (<Id_t History_Other 36>, 'bar')]
---
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Other 36>, "'!!'"), (<Id_t History_Other 36>, ' $'), (<Id_t History_Other 36>, "'!!'"), (<Id_t History_Other 36>, ' ')]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Other 36>, "'!! ")]
[(<Id_t History_Other 36>, 'echo '), (<Id_t History_Other 36>, "\\'"), (<Id_t History_Other 36>, ' '), (<Id_t History_Op 33>, '!!'), (<Id_t History_Other 36>, ' ')]
[(<Id_t PS_Literals 260>, 'foo')]
[(<Id_t PS_Subst 256>, '\\h'), (<Id_t PS_Literals 260>, ' '), (<Id_t PS_Subst 256>, '\\w'), (<Id_t PS_Literals 260>, ' '), (<Id_t PS_Subst 256>, '\\$')]
P '[^\\\\\\0]+'