oss-fuzz: json stackoverflow crash

[tomtau]

Describe the bug
The fuzzer found a crash on the json parser.

To Reproduce

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Expected behavior
The parser shouldn't crash.

Additional context
https://oss-fuzz.com/testcase-detail/4724787783270400

[tomtau]

the issue was introduced in these two commits: f668fcc...5a05e69

[tomtau]

a part of the stack trace:

  | #1 0x5bd9336f988b in pest::parser_state::ParserState$LT$R$GT$::sequence::h17855cb945d35dcb pest/pest/src/parser_state.rs:506:27
-- | --
  | #2 0x5bd9336e010a in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::escape::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::hbca2c7795bfb9d5d pest/grammars/src/lib.rs:39:14
  | #3 0x5bd9336e010a in pest::parser_state::ParserState$LT$R$GT$::atomic::h660b34b19a5b55d6 pest/pest/src/parser_state.rs:953:22
  | #4 0x5bd933664650 in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::escape::_$u7b$u7b$closure$u7d$u7d$::h144685aeaf0931bb pest/grammars/src/lib.rs:39:14
  | #5 0x5bd933664650 in pest::parser_state::ParserState$LT$R$GT$::rule::h1d918843eef01594 pest/pest/src/parser_state.rs:315:22
  | #6 0x5bd93372cadc in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::escape::h0738e423b5348bff pest/grammars/src/lib.rs:39:14
  | #7 0x5bd93372cadc in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::inner::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::h97407facf8145c92 pest/grammars/src/lib.rs:39:14
  | #8 0x5bd93372cadc in pest::parser_state::ParserState$LT$R$GT$::sequence::hef729af692bf4535 pest/pest/src/parser_state.rs:508:22
  | #9 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::inner::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::hb2a228ca7fd0f7c0 pest/grammars/src/lib.rs:39:14
  | #10 0x5bd9337205bd in pest::parser_state::ParserState$LT$R$GT$::optional::h992dc16d90938dcb pest/pest/src/parser_state.rs:597:15
  | #11 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::inner::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::h64319116f4df1170 pest/grammars/src/lib.rs:39:14
  | #12 0x5bd9337205bd in core::result::Result$LT$T$C$E$GT$::and_then::h024ac972b9102a01 /rustc/d0f204e4d750b62f9d6c2593405e828757126832/library/core/src/result.rs:1340:22
  | #13 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$GT$::parse::rules::visible::inner::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::_$u7b$u7b$closure$u7d$u7d$::h9183c1bd87e6b44d pest/grammars/src/lib.rs:39:14

#1 0x5bd9336f988b in pest::parser_state::ParserState$LT$R$GT$::sequence::h17855cb945d35dcb [pest/pest/src/parser_state.rs:506](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/pest/src/parser_state.rs#L506):27
	    #2 0x5bd9336e010a in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::escape::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hbca2c7795bfb9d5d [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #3 0x5bd9336e010a in pest::parser_state::ParserState$LT$R$GT$::atomic::h660b34b19a5b55d6 [pest/pest/src/parser_state.rs:953](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/pest/src/parser_state.rs#L953):22
	    #4 0x5bd933664650 in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::escape::_$u7b$$u7b$closure$u7d$$u7d$::h144685aeaf0931bb [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #5 0x5bd933664650 in pest::parser_state::ParserState$LT$R$GT$::rule::h1d918843eef01594 [pest/pest/src/parser_state.rs:315](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/pest/src/parser_state.rs#L315):22
	    #6 0x5bd93372cadc in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::escape::h0738e423b5348bff [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #7 0x5bd93372cadc in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::inner::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h97407facf8145c92 [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #8 0x5bd93372cadc in pest::parser_state::ParserState$LT$R$GT$::sequence::hef729af692bf4535 [pest/pest/src/parser_state.rs:508](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/pest/src/parser_state.rs#L508):22
	    #9 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::inner::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hb2a228ca7fd0f7c0 [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #10 0x5bd9337205bd in pest::parser_state::ParserState$LT$R$GT$::optional::h992dc16d90938dcb [pest/pest/src/parser_state.rs:597](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/pest/src/parser_state.rs#L597):15
	    #11 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::inner::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h64319116f4df1170 [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
	    #12 0x5bd9337205bd in core::result::Result$LT$T$C$E$GT$::and_then::h024ac972b9102a01 /rustc/d0f204e4d750b62f9d6c2593405e828757126832/library/core/src/result.rs:1340:22
	    #13 0x5bd9337205bd in _$LT$pest_grammars..json..JsonParser$u20$as$u20$pest..parser..Parser$LT$pest_grammars..json..Rule$GT$$GT$::parse::rules::visible::inner::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h9183c1bd87e6b44d [pest/grammars/src/lib.rs:39](https://github.com/pest-parser/pest/blob/5a05e696c88a07d8123665aa20e220c3d651c131/grammars/src/lib.rs#L39):14
...